summaryrefslogtreecommitdiffstats
path: root/src/PDFGen/pdfgen.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 22:13:02 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 22:13:02 +0000
commite244c93d21bcacf1a0eedefdcc3018a362274796 (patch)
tree857e0d7bcf20546b38fff97a8702c2c1240bc23b /src/PDFGen/pdfgen.c
parentInitial commit. (diff)
downloadnwipe-e244c93d21bcacf1a0eedefdcc3018a362274796.tar.xz
nwipe-e244c93d21bcacf1a0eedefdcc3018a362274796.zip
Adding upstream version 0.36.upstream/0.36
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/PDFGen/pdfgen.c')
-rw-r--r--src/PDFGen/pdfgen.c4057
1 files changed, 4057 insertions, 0 deletions
diff --git a/src/PDFGen/pdfgen.c b/src/PDFGen/pdfgen.c
new file mode 100644
index 0000000..4d9cf45
--- /dev/null
+++ b/src/PDFGen/pdfgen.c
@@ -0,0 +1,4057 @@
+/* pdfgen.c provided courtesy of https://github.com/AndreRenaud/PDFGen
+ *
+ * Thank You !
+ */
+
+/**
+ * Simple engine for creating PDF files.
+ * It supports text, shapes, images etc...
+ * Capable of handling millions of objects without too much performance
+ * penalty.
+ * Public domain license - no warrenty implied; use at your own risk.
+ */
+
+/**
+ * PDF HINTS & TIPS
+ * The specification can be found at
+ * https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/pdf_reference_archives/PDFReference.pdf
+ * The following sites have various bits & pieces about PDF document
+ * generation
+ * http://www.mactech.com/articles/mactech/Vol.15/15.09/PDFIntro/index.html
+ * http://gnupdf.org/Introduction_to_PDF
+ * http://www.planetpdf.com/mainpage.asp?WebPageID=63
+ * http://archive.vector.org.uk/art10008970
+ * http://www.adobe.com/devnet/acrobat/pdfs/pdf_reference_1-7.pdf
+ * https://blog.idrsolutions.com/2013/01/understanding-the-pdf-file-format-overview/
+ *
+ * To validate the PDF output, there are several online validators:
+ * http://www.validatepdfa.com/online.htm
+ * http://www.datalogics.com/products/callas/callaspdfA-onlinedemo.asp
+ * http://www.pdf-tools.com/pdf/validate-pdfa-online.aspx
+ *
+ * In addition the 'pdftk' server can be used to analyse the output:
+ * https://www.pdflabs.com/docs/pdftk-cli-examples/
+ *
+ * PDF page markup operators:
+ * b closepath, fill,and stroke path.
+ * B fill and stroke path.
+ * b* closepath, eofill,and stroke path.
+ * B* eofill and stroke path.
+ * BI begin image.
+ * BMC begin marked content.
+ * BT begin text object.
+ * BX begin section allowing undefined operators.
+ * c curveto.
+ * cm concat. Concatenates the matrix to the current transform.
+ * cs setcolorspace for fill.
+ * CS setcolorspace for stroke.
+ * d setdash.
+ * Do execute the named XObject.
+ * DP mark a place in the content stream, with a dictionary.
+ * EI end image.
+ * EMC end marked content.
+ * ET end text object.
+ * EX end section that allows undefined operators.
+ * f fill path.
+ * f* eofill Even/odd fill path.
+ * g setgray (fill).
+ * G setgray (stroke).
+ * gs set parameters in the extended graphics state.
+ * h closepath.
+ * i setflat.
+ * ID begin image data.
+ * j setlinejoin.
+ * J setlinecap.
+ * k setcmykcolor (fill).
+ * K setcmykcolor (stroke).
+ * l lineto.
+ * m moveto.
+ * M setmiterlimit.
+ * n end path without fill or stroke.
+ * q save graphics state.
+ * Q restore graphics state.
+ * re rectangle.
+ * rg setrgbcolor (fill).
+ * RG setrgbcolor (stroke).
+ * s closepath and stroke path.
+ * S stroke path.
+ * sc setcolor (fill).
+ * SC setcolor (stroke).
+ * sh shfill (shaded fill).
+ * Tc set character spacing.
+ * Td move text current point.
+ * TD move text current point and set leading.
+ * Tf set font name and size.
+ * Tj show text.
+ * TJ show text, allowing individual character positioning.
+ * TL set leading.
+ * Tm set text matrix.
+ * Tr set text rendering mode.
+ * Ts set super/subscripting text rise.
+ * Tw set word spacing.
+ * Tz set horizontal scaling.
+ * T* move to start of next line.
+ * v curveto.
+ * w setlinewidth.
+ * W clip.
+ * y curveto.
+ */
+
+#if defined(_MSC_VER)
+#define _CRT_SECURE_NO_WARNINGS 1 // Drop the MSVC complaints about snprintf
+#define _USE_MATH_DEFINES
+#include <BaseTsd.h>
+typedef SSIZE_T ssize_t;
+#else
+
+#ifndef _POSIX_SOURCE
+#define _POSIX_SOURCE /* For localtime_r */
+#endif
+
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600 /* for M_SQRT2 */
+#endif
+
+#include <sys/types.h> /* for ssize_t */
+#endif
+
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <locale.h>
+#include <math.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <time.h>
+
+#include "pdfgen.h"
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+
+#define PDF_RGB_R(c) (float)((((c) >> 16) & 0xff) / 255.0)
+#define PDF_RGB_G(c) (float)((((c) >> 8) & 0xff) / 255.0)
+#define PDF_RGB_B(c) (float)((((c) >> 0) & 0xff) / 255.0)
+#define PDF_IS_TRANSPARENT(c) (((c) >> 24) == 0xff)
+
+#if defined(_MSC_VER)
+#define inline __inline
+#define snprintf _snprintf
+#define strcasecmp _stricmp
+#define strncasecmp _strnicmp
+#ifdef stat
+#undef stat
+#endif
+#define stat _stat
+#define SKIP_ATTRIBUTE
+#else
+#include <strings.h> // strcasecmp
+#endif
+
+/**
+ * Try and support big & little endian machines
+ */
+static inline uint32_t bswap32(uint32_t x)
+{
+ return (((x & 0xff000000u) >> 24) | ((x & 0x00ff0000u) >> 8) |
+ ((x & 0x0000ff00u) << 8) | ((x & 0x000000ffu) << 24));
+}
+
+#ifdef __has_include // C++17, supported as extension to C++11 in clang, GCC
+ // 5+, vs2015
+#if __has_include(<endian.h>)
+#include <endian.h> // gnu libc normally provides, linux
+#elif __has_include(<machine/endian.h>)
+#include <machine/endian.h> //open bsd, macos
+#elif __has_include(<sys/param.h>)
+#include <sys/param.h> // mingw, some bsd (not open/macos)
+#elif __has_include(<sys/isadefs.h>)
+#include <sys/isadefs.h> // solaris
+#endif
+#endif
+
+#if !defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)
+#ifndef __BYTE_ORDER__
+/* Fall back to little endian by default */
+#define __LITTLE_ENDIAN__
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ || __BYTE_ORDER == __BIG_ENDIAN
+#define __BIG_ENDIAN__
+#else
+#define __LITTLE_ENDIAN__
+#endif
+#endif
+
+#if defined(__LITTLE_ENDIAN__)
+#define ntoh32(x) bswap32((x))
+#elif defined(__BIG_ENDIAN__)
+#define ntoh32(x) (x)
+#endif
+
+// Limits on image sizes for sanity checking & to avoid plausible overflow
+// issues
+#define MAX_IMAGE_WIDTH (16 * 1024)
+#define MAX_IMAGE_HEIGHT (16 * 1024)
+
+// Signatures for various image formats
+static const uint8_t bmp_signature[] = {'B', 'M'};
+static const uint8_t png_signature[] = {0x89, 0x50, 0x4E, 0x47,
+ 0x0D, 0x0A, 0x1A, 0x0A};
+static const uint8_t jpeg_signature[] = {0xff, 0xd8};
+static const uint8_t ppm_signature[] = {'P', '6'};
+static const uint8_t pgm_signature[] = {'P', '5'};
+
+// Special signatures for PNG chunks
+static const char png_chunk_header[] = "IHDR";
+static const char png_chunk_palette[] = "PLTE";
+static const char png_chunk_data[] = "IDAT";
+static const char png_chunk_end[] = "IEND";
+
+typedef struct pdf_object pdf_object;
+
+enum {
+ OBJ_none, /* skipped */
+ OBJ_info,
+ OBJ_stream,
+ OBJ_font,
+ OBJ_page,
+ OBJ_bookmark,
+ OBJ_outline,
+ OBJ_catalog,
+ OBJ_pages,
+ OBJ_image,
+ OBJ_link,
+
+ OBJ_count,
+};
+
+struct flexarray {
+ void ***bins;
+ int item_count;
+ int bin_count;
+};
+
+/**
+ * Simple dynamic string object. Tries to store a reasonable amount on the
+ * stack before falling back to malloc once things get large
+ */
+struct dstr {
+ char static_data[128];
+ char *data;
+ size_t alloc_len;
+ size_t used_len;
+};
+
+struct pdf_object {
+ int type; /* See OBJ_xxxx */
+ int index; /* PDF output index */
+ int offset; /* Byte position within the output file */
+ struct pdf_object *prev; /* Previous of this type */
+ struct pdf_object *next; /* Next of this type */
+ union {
+ struct {
+ struct pdf_object *page;
+ char name[64];
+ struct pdf_object *parent;
+ struct flexarray children;
+ } bookmark;
+ struct dstr stream;
+ struct {
+ float width;
+ float height;
+ struct flexarray children;
+ struct flexarray annotations;
+ } page;
+ struct pdf_info *info;
+ struct {
+ char name[64];
+ int index;
+ } font;
+ struct {
+ struct pdf_object *page; /* Page containing link */
+ float llx; /* Clickable rectangle */
+ float lly;
+ float urx;
+ float ury;
+ struct pdf_object *target_page; /* Target page */
+ float target_x; /* Target location */
+ float target_y;
+ } link;
+ };
+};
+
+struct pdf_doc {
+ char errstr[128];
+ int errval;
+ struct flexarray objects;
+
+ float width;
+ float height;
+
+ struct pdf_object *current_font;
+
+ struct pdf_object *last_objects[OBJ_count];
+ struct pdf_object *first_objects[OBJ_count];
+};
+
+/**
+ * Since we're casting random areas of memory to these, make sure
+ * they're packed properly to match the image format requirements
+ */
+#pragma pack(push, 1)
+struct png_chunk {
+ uint32_t length;
+ // chunk type, see png_chunk_header, png_chunk_data, png_chunk_end
+ char type[4];
+};
+
+#pragma pack(pop)
+
+// Simple data container to store a single 24 Bit RGB value, used for
+// processing PNG images
+struct rgb_value {
+ uint8_t red;
+ uint8_t blue;
+ uint8_t green;
+};
+
+/**
+ * Simple flexible resizing array implementation
+ * The bins get larger in powers of two
+ * bin 0 = 1024 items
+ * 1 = 2048 items
+ * 2 = 4096 items
+ * etc...
+ */
+/* What is the first index that will be in the given bin? */
+#define MIN_SHIFT 10
+#define MIN_OFFSET ((1 << MIN_SHIFT) - 1)
+static int bin_offset[] = {
+ (1 << (MIN_SHIFT + 0)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 1)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 2)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 3)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 4)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 5)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 6)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 7)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 8)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 9)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 10)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 11)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 12)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 13)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 14)) - 1 - MIN_OFFSET,
+ (1 << (MIN_SHIFT + 15)) - 1 - MIN_OFFSET,
+};
+
+static inline int flexarray_get_bin(const struct flexarray *flex, int index)
+{
+ (void)flex;
+ for (size_t i = 0; i < ARRAY_SIZE(bin_offset); i++)
+ if (index < bin_offset[i])
+ return i - 1;
+ return -1;
+}
+
+static inline int flexarray_get_bin_size(const struct flexarray *flex,
+ int bin)
+{
+ (void)flex;
+ if (bin >= (int)ARRAY_SIZE(bin_offset) - 1)
+ return -1;
+ int next = bin_offset[bin + 1];
+ return next - bin_offset[bin];
+}
+
+static inline int flexarray_get_bin_offset(const struct flexarray *flex,
+ int bin, int index)
+{
+ (void)flex;
+ return index - bin_offset[bin];
+}
+
+static void flexarray_clear(struct flexarray *flex)
+{
+ for (int i = 0; i < flex->bin_count; i++)
+ free(flex->bins[i]);
+ free(flex->bins);
+ flex->bin_count = 0;
+ flex->item_count = 0;
+}
+
+static inline int flexarray_size(const struct flexarray *flex)
+{
+ return flex->item_count;
+}
+
+static int flexarray_set(struct flexarray *flex, int index, void *data)
+{
+ int bin = flexarray_get_bin(flex, index);
+ if (bin < 0)
+ return -EINVAL;
+ if (bin >= flex->bin_count) {
+ void ***bins = (void ***)realloc(flex->bins, (flex->bin_count + 1) *
+ sizeof(*flex->bins));
+ if (!bins)
+ return -ENOMEM;
+ flex->bin_count++;
+ flex->bins = bins;
+ flex->bins[flex->bin_count - 1] =
+ (void **)calloc(flexarray_get_bin_size(flex, flex->bin_count - 1),
+ sizeof(void *));
+ if (!flex->bins[flex->bin_count - 1]) {
+ flex->bin_count--;
+ return -ENOMEM;
+ }
+ }
+ flex->item_count++;
+ flex->bins[bin][flexarray_get_bin_offset(flex, bin, index)] = data;
+ return flex->item_count - 1;
+}
+
+static inline int flexarray_append(struct flexarray *flex, void *data)
+{
+ return flexarray_set(flex, flexarray_size(flex), data);
+}
+
+static inline void *flexarray_get(const struct flexarray *flex, int index)
+{
+ int bin;
+
+ if (index >= flex->item_count)
+ return NULL;
+ bin = flexarray_get_bin(flex, index);
+ if (bin < 0 || bin >= flex->bin_count)
+ return NULL;
+ return flex->bins[bin][flexarray_get_bin_offset(flex, bin, index)];
+}
+
+/**
+ * Simple dynamic string object. Tries to store a reasonable amount on the
+ * stack before falling back to malloc once things get large
+ */
+
+#define INIT_DSTR \
+ (struct dstr) \
+ { \
+ .static_data = {0}, .data = NULL, .alloc_len = 0, .used_len = 0 \
+ }
+
+static char *dstr_data(struct dstr *str)
+{
+ return str->data ? str->data : str->static_data;
+}
+
+static size_t dstr_len(const struct dstr *str)
+{
+ return str->used_len;
+}
+
+static ssize_t dstr_ensure(struct dstr *str, size_t len)
+{
+ if (len <= str->alloc_len)
+ return 0;
+ if (!str->data && len <= sizeof(str->static_data))
+ str->alloc_len = len;
+ else if (str->alloc_len < len) {
+ size_t new_len;
+
+ new_len = len + 4096;
+
+ if (str->data) {
+ char *new_data = (char *)realloc((void *)str->data, new_len);
+ if (!new_data)
+ return -ENOMEM;
+ str->data = new_data;
+ } else {
+ str->data = (char *)malloc(new_len);
+ if (!str->data)
+ return -ENOMEM;
+ if (str->used_len)
+ memcpy(str->data, str->static_data, str->used_len + 1);
+ }
+
+ str->alloc_len = new_len;
+ }
+ return 0;
+}
+
+// Locales can replace the decimal character with a ','.
+// This breaks the PDF output, so we force a 'safe' locale.
+static void force_locale(char *buf, int len)
+{
+ char *saved_locale = setlocale(LC_ALL, NULL);
+
+ if (!saved_locale) {
+ *buf = '\0';
+ } else {
+ strncpy(buf, saved_locale, len - 1);
+ buf[len - 1] = '\0';
+ }
+
+ setlocale(LC_NUMERIC, "POSIX");
+}
+
+static void restore_locale(char *buf)
+{
+ setlocale(LC_ALL, buf);
+}
+
+#ifndef SKIP_ATTRIBUTE
+static int dstr_printf(struct dstr *str, const char *fmt, ...)
+ __attribute__((format(printf, 2, 3)));
+#endif
+static int dstr_printf(struct dstr *str, const char *fmt, ...)
+{
+ va_list ap, aq;
+ int len;
+ char saved_locale[32];
+
+ force_locale(saved_locale, sizeof(saved_locale));
+
+ va_start(ap, fmt);
+ va_copy(aq, ap);
+ len = vsnprintf(NULL, 0, fmt, ap);
+ if (dstr_ensure(str, str->used_len + len + 1) < 0) {
+ va_end(ap);
+ va_end(aq);
+ restore_locale(saved_locale);
+ return -ENOMEM;
+ }
+ vsprintf(dstr_data(str) + str->used_len, fmt, aq);
+ str->used_len += len;
+ va_end(ap);
+ va_end(aq);
+ restore_locale(saved_locale);
+
+ return len;
+}
+
+static ssize_t dstr_append_data(struct dstr *str, const void *extend,
+ size_t len)
+{
+ if (dstr_ensure(str, str->used_len + len + 1) < 0)
+ return -ENOMEM;
+ memcpy(dstr_data(str) + str->used_len, extend, len);
+ str->used_len += len;
+ dstr_data(str)[str->used_len] = '\0';
+ return len;
+}
+
+static ssize_t dstr_append(struct dstr *str, const char *extend)
+{
+ return dstr_append_data(str, extend, strlen(extend));
+}
+
+static void dstr_free(struct dstr *str)
+{
+ if (str->data)
+ free(str->data);
+ *str = INIT_DSTR;
+}
+
+/**
+ * PDF Implementation
+ */
+
+#ifndef SKIP_ATTRIBUTE
+static int pdf_set_err(struct pdf_doc *doc, int errval, const char *buffer,
+ ...) __attribute__((format(printf, 3, 4)));
+#endif
+static int pdf_set_err(struct pdf_doc *doc, int errval, const char *buffer,
+ ...)
+{
+ va_list ap;
+ int len;
+
+ va_start(ap, buffer);
+ len = vsnprintf(doc->errstr, sizeof(doc->errstr) - 1, buffer, ap);
+ va_end(ap);
+
+ if (len < 0) {
+ doc->errstr[0] = '\0';
+ return errval;
+ }
+
+ if (len >= (int)(sizeof(doc->errstr) - 1))
+ len = (int)(sizeof(doc->errstr) - 1);
+
+ doc->errstr[len] = '\0';
+ doc->errval = errval;
+
+ return errval;
+}
+
+const char *pdf_get_err(const struct pdf_doc *pdf, int *errval)
+{
+ if (!pdf)
+ return NULL;
+ if (pdf->errstr[0] == '\0')
+ return NULL;
+ if (errval)
+ *errval = pdf->errval;
+ return pdf->errstr;
+}
+
+void pdf_clear_err(struct pdf_doc *pdf)
+{
+ if (!pdf)
+ return;
+ pdf->errstr[0] = '\0';
+ pdf->errval = 0;
+}
+
+static int pdf_get_errval(struct pdf_doc *pdf)
+{
+ if (!pdf)
+ return 0;
+ return pdf->errval;
+}
+
+static struct pdf_object *pdf_get_object(const struct pdf_doc *pdf, int index)
+{
+ return (struct pdf_object *)flexarray_get(&pdf->objects, index);
+}
+
+static int pdf_append_object(struct pdf_doc *pdf, struct pdf_object *obj)
+{
+ int index = flexarray_append(&pdf->objects, obj);
+
+ if (index < 0)
+ return index;
+ obj->index = index;
+
+ if (pdf->last_objects[obj->type]) {
+ obj->prev = pdf->last_objects[obj->type];
+ pdf->last_objects[obj->type]->next = obj;
+ }
+ pdf->last_objects[obj->type] = obj;
+
+ if (!pdf->first_objects[obj->type])
+ pdf->first_objects[obj->type] = obj;
+
+ return 0;
+}
+
+static void pdf_object_destroy(struct pdf_object *object)
+{
+ switch (object->type) {
+ case OBJ_stream:
+ case OBJ_image:
+ dstr_free(&object->stream);
+ break;
+ case OBJ_page:
+ flexarray_clear(&object->page.children);
+ flexarray_clear(&object->page.annotations);
+ break;
+ case OBJ_info:
+ free(object->info);
+ break;
+ case OBJ_bookmark:
+ flexarray_clear(&object->bookmark.children);
+ break;
+ }
+ free(object);
+}
+
+static struct pdf_object *pdf_add_object(struct pdf_doc *pdf, int type)
+{
+ struct pdf_object *obj;
+
+ if (!pdf)
+ return NULL;
+
+ obj = (struct pdf_object *)calloc(1, sizeof(*obj));
+ if (!obj) {
+ pdf_set_err(pdf, -errno,
+ "Unable to allocate object %d of type %d: %s",
+ flexarray_size(&pdf->objects) + 1, type, strerror(errno));
+ return NULL;
+ }
+
+ obj->type = type;
+
+ if (pdf_append_object(pdf, obj) < 0) {
+ free(obj);
+ return NULL;
+ }
+
+ return obj;
+}
+
+static void pdf_del_object(struct pdf_doc *pdf, struct pdf_object *obj)
+{
+ int type = obj->type;
+ flexarray_set(&pdf->objects, obj->index, NULL);
+ if (pdf->last_objects[type] == obj) {
+ pdf->last_objects[type] = NULL;
+ for (int i = 0; i < flexarray_size(&pdf->objects); i++) {
+ struct pdf_object *o = pdf_get_object(pdf, i);
+ if (o && o->type == type)
+ pdf->last_objects[type] = o;
+ }
+ }
+
+ if (pdf->first_objects[type] == obj) {
+ pdf->first_objects[type] = NULL;
+ for (int i = 0; i < flexarray_size(&pdf->objects); i++) {
+ struct pdf_object *o = pdf_get_object(pdf, i);
+ if (o && o->type == type) {
+ pdf->first_objects[type] = o;
+ break;
+ }
+ }
+ }
+
+ pdf_object_destroy(obj);
+}
+
+struct pdf_doc *pdf_create(float width, float height,
+ const struct pdf_info *info)
+{
+ struct pdf_doc *pdf;
+ struct pdf_object *obj;
+
+ pdf = (struct pdf_doc *)calloc(1, sizeof(*pdf));
+ if (!pdf)
+ return NULL;
+ pdf->width = width;
+ pdf->height = height;
+
+ /* We don't want to use ID 0 */
+ pdf_add_object(pdf, OBJ_none);
+
+ /* Create the 'info' object */
+ obj = pdf_add_object(pdf, OBJ_info);
+ if (!obj) {
+ pdf_destroy(pdf);
+ return NULL;
+ }
+ obj->info = (struct pdf_info *)calloc(sizeof(*obj->info), 1);
+ if (!obj->info) {
+ pdf_destroy(pdf);
+ return NULL;
+ }
+ if (info) {
+ *obj->info = *info;
+ obj->info->creator[sizeof(obj->info->creator) - 1] = '\0';
+ obj->info->producer[sizeof(obj->info->producer) - 1] = '\0';
+ obj->info->title[sizeof(obj->info->title) - 1] = '\0';
+ obj->info->author[sizeof(obj->info->author) - 1] = '\0';
+ obj->info->subject[sizeof(obj->info->subject) - 1] = '\0';
+ obj->info->date[sizeof(obj->info->date) - 1] = '\0';
+ }
+ /* FIXME: Should be quoting PDF strings? */
+ if (!obj->info->date[0]) {
+ time_t now = time(NULL);
+ struct tm tm;
+#ifdef _WIN32
+ struct tm *tmp;
+ tmp = localtime(&now);
+ tm = *tmp;
+#else
+ localtime_r(&now, &tm);
+#endif
+ strftime(obj->info->date, sizeof(obj->info->date), "%Y%m%d%H%M%SZ",
+ &tm);
+ }
+
+ if (!pdf_add_object(pdf, OBJ_pages)) {
+ pdf_destroy(pdf);
+ return NULL;
+ }
+ if (!pdf_add_object(pdf, OBJ_catalog)) {
+ pdf_destroy(pdf);
+ return NULL;
+ }
+
+ if (pdf_set_font(pdf, "Times-Roman") < 0) {
+ pdf_destroy(pdf);
+ return NULL;
+ }
+
+ return pdf;
+}
+
+float pdf_width(const struct pdf_doc *pdf)
+{
+ return pdf->width;
+}
+
+float pdf_height(const struct pdf_doc *pdf)
+{
+ return pdf->height;
+}
+
+float pdf_page_width(const struct pdf_object *page)
+{
+ return page->page.width;
+}
+
+float pdf_page_height(const struct pdf_object *page)
+{
+ return page->page.height;
+}
+
+void pdf_destroy(struct pdf_doc *pdf)
+{
+ if (pdf) {
+ for (int i = 0; i < flexarray_size(&pdf->objects); i++)
+ pdf_object_destroy(pdf_get_object(pdf, i));
+ flexarray_clear(&pdf->objects);
+ free(pdf);
+ }
+}
+
+static struct pdf_object *pdf_find_first_object(const struct pdf_doc *pdf,
+ int type)
+{
+ if (!pdf)
+ return NULL;
+ return pdf->first_objects[type];
+}
+
+static struct pdf_object *pdf_find_last_object(const struct pdf_doc *pdf,
+ int type)
+{
+ if (!pdf)
+ return NULL;
+ return pdf->last_objects[type];
+}
+
+int pdf_set_font(struct pdf_doc *pdf, const char *font)
+{
+ struct pdf_object *obj;
+ int last_index = 0;
+
+ /* See if we've used this font before */
+ for (obj = pdf_find_first_object(pdf, OBJ_font); obj; obj = obj->next) {
+ if (strcmp(obj->font.name, font) == 0)
+ break;
+ last_index = obj->font.index;
+ }
+
+ /* Create a new font object if we need it */
+ if (!obj) {
+ obj = pdf_add_object(pdf, OBJ_font);
+ if (!obj)
+ return pdf->errval;
+ strncpy(obj->font.name, font, sizeof(obj->font.name) - 1);
+ obj->font.name[sizeof(obj->font.name) - 1] = '\0';
+ obj->font.index = last_index + 1;
+ }
+
+ pdf->current_font = obj;
+
+ return 0;
+}
+
+struct pdf_object *pdf_append_page(struct pdf_doc *pdf)
+{
+ struct pdf_object *page;
+
+ page = pdf_add_object(pdf, OBJ_page);
+
+ if (!page)
+ return NULL;
+
+ page->page.width = pdf->width;
+ page->page.height = pdf->height;
+
+ return page;
+}
+
+int pdf_page_set_size(struct pdf_doc *pdf, struct pdf_object *page,
+ float width, float height)
+{
+ if (!page)
+ page = pdf_find_last_object(pdf, OBJ_page);
+
+ if (!page || page->type != OBJ_page)
+ return pdf_set_err(pdf, -EINVAL, "Invalid PDF page");
+ page->page.width = width;
+ page->page.height = height;
+ return 0;
+}
+
+// Recursively scan for the number of children
+static int pdf_get_bookmark_count(const struct pdf_object *obj)
+{
+ int count = 0;
+ if (obj->type == OBJ_bookmark) {
+ int nchildren = flexarray_size(&obj->bookmark.children);
+ count += nchildren;
+ for (int i = 0; i < nchildren; i++) {
+ count += pdf_get_bookmark_count(
+ (const struct pdf_object *)flexarray_get(
+ &obj->bookmark.children, i));
+ }
+ }
+ return count;
+}
+
+static int pdf_save_object(struct pdf_doc *pdf, FILE *fp, int index)
+{
+ struct pdf_object *object = pdf_get_object(pdf, index);
+ if (!object)
+ return -ENOENT;
+
+ if (object->type == OBJ_none)
+ return -ENOENT;
+
+ object->offset = ftell(fp);
+
+ fprintf(fp, "%d 0 obj\r\n", index);
+
+ switch (object->type) {
+ case OBJ_stream:
+ case OBJ_image: {
+ fwrite(dstr_data(&object->stream), dstr_len(&object->stream), 1, fp);
+ break;
+ }
+ case OBJ_info: {
+ struct pdf_info *info = object->info;
+
+ fprintf(fp, "<<\r\n");
+ if (info->creator[0])
+ fprintf(fp, " /Creator (%s)\r\n", info->creator);
+ if (info->producer[0])
+ fprintf(fp, " /Producer (%s)\r\n", info->producer);
+ if (info->title[0])
+ fprintf(fp, " /Title (%s)\r\n", info->title);
+ if (info->author[0])
+ fprintf(fp, " /Author (%s)\r\n", info->author);
+ if (info->subject[0])
+ fprintf(fp, " /Subject (%s)\r\n", info->subject);
+ if (info->date[0])
+ fprintf(fp, " /CreationDate (D:%s)\r\n", info->date);
+ fprintf(fp, ">>\r\n");
+ break;
+ }
+
+ case OBJ_page: {
+ struct pdf_object *pages = pdf_find_first_object(pdf, OBJ_pages);
+ struct pdf_object *image = pdf_find_first_object(pdf, OBJ_image);
+
+ fprintf(fp,
+ "<<\r\n"
+ " /Type /Page\r\n"
+ " /Parent %d 0 R\r\n",
+ pages->index);
+ fprintf(fp, " /MediaBox [0 0 %f %f]\r\n", object->page.width,
+ object->page.height);
+ fprintf(fp, " /Resources <<\r\n");
+ fprintf(fp, " /Font <<\r\n");
+ for (struct pdf_object *font = pdf_find_first_object(pdf, OBJ_font);
+ font; font = font->next)
+ fprintf(fp, " /F%d %d 0 R\r\n", font->font.index,
+ font->index);
+ fprintf(fp, " >>\r\n");
+ // We trim transparency to just 4-bits
+ fprintf(fp, " /ExtGState <<\r\n");
+ for (int i = 0; i < 16; i++) {
+ fprintf(fp, " /GS%d <</ca %f>>\r\n", i,
+ (float)(15 - i) / 15);
+ }
+ fprintf(fp, " >>\r\n");
+
+ if (image) {
+ fprintf(fp, " /XObject <<");
+ for (; image; image = image->next)
+ fprintf(fp, " /Image%d %d 0 R ", image->index,
+ image->index);
+ fprintf(fp, " >>\r\n");
+ }
+ fprintf(fp, " >>\r\n");
+
+ fprintf(fp, " /Contents [\r\n");
+ for (int i = 0; i < flexarray_size(&object->page.children); i++) {
+ struct pdf_object *child =
+ (struct pdf_object *)flexarray_get(&object->page.children, i);
+ fprintf(fp, "%d 0 R\r\n", child->index);
+ }
+ fprintf(fp, "]\r\n");
+
+ if (flexarray_size(&object->page.annotations)) {
+ fprintf(fp, " /Annots [\r\n");
+ for (int i = 0; i < flexarray_size(&object->page.annotations);
+ i++) {
+ struct pdf_object *child = (struct pdf_object *)flexarray_get(
+ &object->page.annotations, i);
+ fprintf(fp, "%d 0 R\r\n", child->index);
+ }
+ fprintf(fp, "]\r\n");
+ }
+
+ fprintf(fp, ">>\r\n");
+ break;
+ }
+
+ case OBJ_bookmark: {
+ struct pdf_object *parent, *other;
+
+ parent = object->bookmark.parent;
+ if (!parent)
+ parent = pdf_find_first_object(pdf, OBJ_outline);
+ if (!object->bookmark.page)
+ break;
+ fprintf(fp,
+ "<<\r\n"
+ " /Dest [%d 0 R /XYZ 0 %f null]\r\n"
+ " /Parent %d 0 R\r\n"
+ " /Title (%s)\r\n",
+ object->bookmark.page->index, pdf->height, parent->index,
+ object->bookmark.name);
+ int nchildren = flexarray_size(&object->bookmark.children);
+ if (nchildren > 0) {
+ struct pdf_object *f, *l;
+ f = (struct pdf_object *)flexarray_get(&object->bookmark.children,
+ 0);
+ l = (struct pdf_object *)flexarray_get(&object->bookmark.children,
+ nchildren - 1);
+ fprintf(fp, " /First %d 0 R\r\n", f->index);
+ fprintf(fp, " /Last %d 0 R\r\n", l->index);
+ fprintf(fp, " /Count %d\r\n", pdf_get_bookmark_count(object));
+ }
+ // Find the previous bookmark with the same parent
+ for (other = object->prev;
+ other && other->bookmark.parent != object->bookmark.parent;
+ other = other->prev)
+ ;
+ if (other)
+ fprintf(fp, " /Prev %d 0 R\r\n", other->index);
+ // Find the next bookmark with the same parent
+ for (other = object->next;
+ other && other->bookmark.parent != object->bookmark.parent;
+ other = other->next)
+ ;
+ if (other)
+ fprintf(fp, " /Next %d 0 R\r\n", other->index);
+ fprintf(fp, ">>\r\n");
+ break;
+ }
+
+ case OBJ_outline: {
+ struct pdf_object *first, *last, *cur;
+ first = pdf_find_first_object(pdf, OBJ_bookmark);
+ last = pdf_find_last_object(pdf, OBJ_bookmark);
+
+ if (first && last) {
+ int count = 0;
+ cur = first;
+ while (cur) {
+ if (!cur->bookmark.parent)
+ count += pdf_get_bookmark_count(cur) + 1;
+ cur = cur->next;
+ }
+
+ /* Bookmark outline */
+ fprintf(fp,
+ "<<\r\n"
+ " /Count %d\r\n"
+ " /Type /Outlines\r\n"
+ " /First %d 0 R\r\n"
+ " /Last %d 0 R\r\n"
+ ">>\r\n",
+ count, first->index, last->index);
+ }
+ break;
+ }
+
+ case OBJ_font:
+ fprintf(fp,
+ "<<\r\n"
+ " /Type /Font\r\n"
+ " /Subtype /Type1\r\n"
+ " /BaseFont /%s\r\n"
+ " /Encoding /WinAnsiEncoding\r\n"
+ ">>\r\n",
+ object->font.name);
+ break;
+
+ case OBJ_pages: {
+ int npages = 0;
+
+ fprintf(fp, "<<\r\n"
+ " /Type /Pages\r\n"
+ " /Kids [ ");
+ for (struct pdf_object *page = pdf_find_first_object(pdf, OBJ_page);
+ page; page = page->next) {
+ npages++;
+ fprintf(fp, "%d 0 R ", page->index);
+ }
+ fprintf(fp, "]\r\n");
+ fprintf(fp, " /Count %d\r\n", npages);
+ fprintf(fp, ">>\r\n");
+ break;
+ }
+
+ case OBJ_catalog: {
+ struct pdf_object *outline = pdf_find_first_object(pdf, OBJ_outline);
+ struct pdf_object *pages = pdf_find_first_object(pdf, OBJ_pages);
+
+ fprintf(fp, "<<\r\n"
+ " /Type /Catalog\r\n");
+ if (outline)
+ fprintf(fp,
+ " /Outlines %d 0 R\r\n"
+ " /PageMode /UseOutlines\r\n",
+ outline->index);
+ fprintf(fp,
+ " /Pages %d 0 R\r\n"
+ ">>\r\n",
+ pages->index);
+ break;
+ }
+
+ case OBJ_link: {
+ fprintf(fp,
+ "<<\r\n"
+ " /Type /Annot\r\n"
+ " /Subtype /Link\r\n"
+ " /Rect [%f %f %f %f]\r\n"
+ " /Dest [%u 0 R /XYZ %f %f null]\r\n"
+ " /Border [0 0 0]\r\n"
+ ">>\r\n",
+ object->link.llx, object->link.lly, object->link.urx,
+ object->link.ury, object->link.target_page->index,
+ object->link.target_x, object->link.target_y);
+ break;
+ }
+
+ default:
+ return pdf_set_err(pdf, -EINVAL, "Invalid PDF object type %d",
+ object->type);
+ }
+
+ fprintf(fp, "endobj\r\n");
+
+ return 0;
+}
+
+// Slightly modified djb2 hash algorithm to get pseudo-random ID
+static uint64_t hash(uint64_t hash, const void *data, size_t len)
+{
+ const uint8_t *d8 = (const uint8_t *)data;
+ for (; len; len--) {
+ hash = (((hash & 0x03ffffffffffffff) << 5) +
+ (hash & 0x7fffffffffffffff)) +
+ *d8++;
+ }
+ return hash;
+}
+
+int pdf_save_file(struct pdf_doc *pdf, FILE *fp)
+{
+ struct pdf_object *obj;
+ int xref_offset;
+ int xref_count = 0;
+ uint64_t id1, id2;
+ time_t now = time(NULL);
+ char saved_locale[32];
+
+ force_locale(saved_locale, sizeof(saved_locale));
+
+ fprintf(fp, "%%PDF-1.3\r\n");
+ /* Hibit bytes */
+ fprintf(fp, "%c%c%c%c%c\r\n", 0x25, 0xc7, 0xec, 0x8f, 0xa2);
+
+ /* Dump all the objects & get their file offsets */
+ for (int i = 0; i < flexarray_size(&pdf->objects); i++)
+ if (pdf_save_object(pdf, fp, i) >= 0)
+ xref_count++;
+
+ /* xref */
+ xref_offset = ftell(fp);
+ fprintf(fp, "xref\r\n");
+ fprintf(fp, "0 %d\r\n", xref_count + 1);
+ fprintf(fp, "0000000000 65535 f\r\n");
+ for (int i = 0; i < flexarray_size(&pdf->objects); i++) {
+ obj = pdf_get_object(pdf, i);
+ if (obj->type != OBJ_none)
+ fprintf(fp, "%10.10d 00000 n\r\n", obj->offset);
+ }
+
+ fprintf(fp,
+ "trailer\r\n"
+ "<<\r\n"
+ "/Size %d\r\n",
+ xref_count + 1);
+ obj = pdf_find_first_object(pdf, OBJ_catalog);
+ fprintf(fp, "/Root %d 0 R\r\n", obj->index);
+ obj = pdf_find_first_object(pdf, OBJ_info);
+ fprintf(fp, "/Info %d 0 R\r\n", obj->index);
+ /* Generate document unique IDs */
+ id1 = hash(5381, obj->info, sizeof(struct pdf_info));
+ id1 = hash(id1, &xref_count, sizeof(xref_count));
+ id2 = hash(5381, &now, sizeof(now));
+ fprintf(fp, "/ID [<%16.16" PRIx64 "> <%16.16" PRIx64 ">]\r\n", id1, id2);
+ fprintf(fp, ">>\r\n"
+ "startxref\r\n");
+ fprintf(fp, "%d\r\n", xref_offset);
+ fprintf(fp, "%%%%EOF\r\n");
+
+ restore_locale(saved_locale);
+
+ return 0;
+}
+
+int pdf_save(struct pdf_doc *pdf, const char *filename)
+{
+ FILE *fp;
+ int e;
+
+ if (filename == NULL)
+ fp = stdout;
+ else if ((fp = fopen(filename, "wb")) == NULL)
+ return pdf_set_err(pdf, -errno, "Unable to open '%s': %s", filename,
+ strerror(errno));
+
+ e = pdf_save_file(pdf, fp);
+
+ if (fp != stdout)
+ if (fclose(fp) != 0 && e >= 0)
+ return pdf_set_err(pdf, -errno, "Unable to close '%s': %s",
+ filename, strerror(errno));
+
+ return e;
+}
+
+static int pdf_add_stream(struct pdf_doc *pdf, struct pdf_object *page,
+ const char *buffer)
+{
+ struct pdf_object *obj;
+ size_t len;
+
+ if (!page)
+ page = pdf_find_last_object(pdf, OBJ_page);
+
+ if (!page)
+ return pdf_set_err(pdf, -EINVAL, "Invalid pdf page");
+
+ len = strlen(buffer);
+ /* We don't want any trailing whitespace in the stream */
+ while (len >= 1 && (buffer[len - 1] == '\r' || buffer[len - 1] == '\n'))
+ len--;
+
+ obj = pdf_add_object(pdf, OBJ_stream);
+ if (!obj)
+ return pdf->errval;
+
+ dstr_printf(&obj->stream, "<< /Length %zu >>stream\r\n", len);
+ dstr_append_data(&obj->stream, buffer, len);
+ dstr_append(&obj->stream, "\r\nendstream\r\n");
+
+ return flexarray_append(&page->page.children, obj);
+}
+
+int pdf_add_bookmark(struct pdf_doc *pdf, struct pdf_object *page, int parent,
+ const char *name)
+{
+ struct pdf_object *obj, *outline = NULL;
+
+ if (!page)
+ page = pdf_find_last_object(pdf, OBJ_page);
+
+ if (!page)
+ return pdf_set_err(pdf, -EINVAL,
+ "Unable to add bookmark, no pages available");
+
+ if (!pdf_find_first_object(pdf, OBJ_outline)) {
+ outline = pdf_add_object(pdf, OBJ_outline);
+ if (!outline)
+ return pdf->errval;
+ }
+
+ obj = pdf_add_object(pdf, OBJ_bookmark);
+ if (!obj) {
+ if (outline)
+ pdf_del_object(pdf, outline);
+ return pdf->errval;
+ }
+
+ strncpy(obj->bookmark.name, name, sizeof(obj->bookmark.name) - 1);
+ obj->bookmark.name[sizeof(obj->bookmark.name) - 1] = '\0';
+ obj->bookmark.page = page;
+ if (parent >= 0) {
+ struct pdf_object *parent_obj = pdf_get_object(pdf, parent);
+ if (!parent_obj)
+ return pdf_set_err(pdf, -EINVAL, "Invalid parent ID %d supplied",
+ parent);
+ obj->bookmark.parent = parent_obj;
+ flexarray_append(&parent_obj->bookmark.children, obj);
+ }
+
+ return obj->index;
+}
+
+int pdf_add_link(struct pdf_doc *pdf, struct pdf_object *page, float x,
+ float y, float width, float height,
+ struct pdf_object *target_page, float target_x,
+ float target_y)
+{
+ struct pdf_object *obj;
+
+ if (!page)
+ page = pdf_find_last_object(pdf, OBJ_page);
+
+ if (!page)
+ return pdf_set_err(pdf, -EINVAL,
+ "Unable to add link, no pages available");
+
+ if (!target_page)
+ return pdf_set_err(pdf, -EINVAL, "Unable to link, no target page");
+
+ obj = pdf_add_object(pdf, OBJ_link);
+ if (!obj) {
+ return pdf->errval;
+ }
+
+ obj->link.target_page = target_page;
+ obj->link.target_x = target_x;
+ obj->link.target_y = target_y;
+ obj->link.llx = x;
+ obj->link.lly = y;
+ obj->link.urx = x + width;
+ obj->link.ury = y + height;
+ flexarray_append(&page->page.annotations, obj);
+
+ return obj->index;
+}
+
+static int utf8_to_utf32(const char *utf8, int len, uint32_t *utf32)
+{
+ uint32_t ch;
+ uint8_t mask;
+
+ if (len <= 0 || !utf8 || !utf32)
+ return -EINVAL;
+
+ ch = *(uint8_t *)utf8;
+ if ((ch & 0x80) == 0) {
+ len = 1;
+ mask = 0x7f;
+ } else if ((ch & 0xe0) == 0xc0 && len >= 2) {
+ len = 2;
+ mask = 0x1f;
+ } else if ((ch & 0xf0) == 0xe0 && len >= 3) {
+ len = 3;
+ mask = 0xf;
+ } else if ((ch & 0xf8) == 0xf0 && len >= 4) {
+ len = 4;
+ mask = 0x7;
+ } else
+ return -EINVAL;
+
+ ch = 0;
+ for (int i = 0; i < len; i++) {
+ int shift = (len - i - 1) * 6;
+ if (!*utf8)
+ return -EINVAL;
+ if (i == 0)
+ ch |= ((uint32_t)(*utf8++) & mask) << shift;
+ else
+ ch |= ((uint32_t)(*utf8++) & 0x3f) << shift;
+ }
+
+ *utf32 = ch;
+
+ return len;
+}
+
+static int utf8_to_pdfencoding(struct pdf_doc *pdf, const char *utf8, int len,
+ uint8_t *res)
+{
+ uint32_t code;
+ int code_len;
+
+ *res = 0;
+
+ code_len = utf8_to_utf32(utf8, len, &code);
+ if (code_len < 0) {
+ return pdf_set_err(pdf, -EINVAL, "Invalid UTF-8 encoding");
+ }
+
+ if (code > 255) {
+ /* We support *some* minimal UTF-8 characters */
+ // See Appendix D of
+ // https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/pdf_reference_archives/PDFReference.pdf
+ // These are all in WinAnsiEncoding
+ switch (code) {
+ case 0x160: // Latin Capital Letter S with Caron
+ *res = 0212;
+ break;
+ case 0x161: // Latin Small Letter S with Caron
+ *res = 0232;
+ break;
+ case 0x17d: // Latin Capital Letter Z with Caron
+ *res = 0216;
+ break;
+ case 0x17e: // Latin Small Letter Z with Caron
+ *res = 0236;
+ break;
+ case 0x2014: // emdash
+ *res = 0227;
+ break;
+ case 0x2018: // left single quote
+ *res = 0221;
+ break;
+ case 0x2019: // right single quote
+ *res = 0222;
+ break;
+ case 0x201c: // left double quote
+ *res = 0223;
+ break;
+ case 0x201d: // right double quote
+ *res = 0224;
+ break;
+ case 0x20ac: // Euro
+ *res = 0200;
+ break;
+ default:
+ return pdf_set_err(pdf, -EINVAL,
+ "Unsupported UTF-8 character: 0x%x 0o%o", code,
+ code);
+ }
+ } else {
+ *res = code;
+ }
+ return code_len;
+}
+
+static int pdf_add_text_spacing(struct pdf_doc *pdf, struct pdf_object *page,
+ const char *text, float size, float xoff,
+ float yoff, uint32_t colour, float spacing)
+{
+ int ret;
+ size_t len = text ? strlen(text) : 0;
+ struct dstr str = INIT_DSTR;
+ int alpha = (colour >> 24) >> 4;
+
+ /* Don't bother adding empty/null strings */
+ if (!len)
+ return 0;
+
+ dstr_append(&str, "BT ");
+ dstr_printf(&str, "/GS%d gs ", alpha);
+ dstr_printf(&str, "%f %f TD ", xoff, yoff);
+ dstr_printf(&str, "/F%d %f Tf ", pdf->current_font->font.index, size);
+ dstr_printf(&str, "%f %f %f rg ", PDF_RGB_R(colour), PDF_RGB_G(colour),
+ PDF_RGB_B(colour));
+ dstr_printf(&str, "%f Tc ", spacing);
+ dstr_append(&str, "(");
+
+ /* Escape magic characters properly */
+ for (size_t i = 0; i < len;) {
+ int code_len;
+ uint8_t pdf_char;
+ code_len = utf8_to_pdfencoding(pdf, &text[i], len - i, &pdf_char);
+ if (code_len < 0) {
+ dstr_free(&str);
+ return code_len;
+ }
+
+ if (strchr("()\\", pdf_char)) {
+ char buf[3];
+ /* Escape some characters */
+ buf[0] = '\\';
+ buf[1] = pdf_char;
+ buf[2] = '\0';
+ dstr_append(&str, buf);
+ } else if (strrchr("\n\r\t\b\f", pdf_char)) {
+ /* Skip over these characters */
+ ;
+ } else {
+ dstr_append_data(&str, &pdf_char, 1);
+ }
+
+ i += code_len;
+ }
+ dstr_append(&str, ") Tj ");
+ dstr_append(&str, "ET");
+
+ ret = pdf_add_stream(pdf, page, dstr_data(&str));
+ dstr_free(&str);
+ return ret;
+}
+
+int pdf_add_text(struct pdf_doc *pdf, struct pdf_object *page,
+ const char *text, float size, float xoff, float yoff,
+ uint32_t colour)
+{
+ return pdf_add_text_spacing(pdf, page, text, size, xoff, yoff, colour, 0);
+}
+
+/* How wide is each character, in points, at size 14 */
+static const uint16_t helvetica_widths[256] = {
+ 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280,
+ 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280,
+ 280, 280, 280, 280, 280, 280, 280, 280, 357, 560, 560, 896, 672,
+ 192, 335, 335, 392, 588, 280, 335, 280, 280, 560, 560, 560, 560,
+ 560, 560, 560, 560, 560, 560, 280, 280, 588, 588, 588, 560, 1023,
+ 672, 672, 727, 727, 672, 615, 784, 727, 280, 504, 672, 560, 839,
+ 727, 784, 672, 784, 727, 672, 615, 727, 672, 951, 672, 672, 615,
+ 280, 280, 280, 472, 560, 335, 560, 560, 504, 560, 560, 280, 560,
+ 560, 223, 223, 504, 223, 839, 560, 560, 560, 560, 335, 504, 280,
+ 560, 504, 727, 504, 504, 504, 336, 262, 336, 588, 352, 560, 352,
+ 223, 560, 335, 1008, 560, 560, 335, 1008, 672, 335, 1008, 352, 615,
+ 352, 352, 223, 223, 335, 335, 352, 560, 1008, 335, 1008, 504, 335,
+ 951, 352, 504, 672, 280, 335, 560, 560, 560, 560, 262, 560, 335,
+ 742, 372, 560, 588, 335, 742, 335, 403, 588, 335, 335, 335, 560,
+ 541, 280, 335, 335, 367, 560, 840, 840, 840, 615, 672, 672, 672,
+ 672, 672, 672, 1008, 727, 672, 672, 672, 672, 280, 280, 280, 280,
+ 727, 727, 784, 784, 784, 784, 784, 588, 784, 727, 727, 727, 727,
+ 672, 672, 615, 560, 560, 560, 560, 560, 560, 896, 504, 560, 560,
+ 560, 560, 280, 280, 280, 280, 560, 560, 560, 560, 560, 560, 560,
+ 588, 615, 560, 560, 560, 560, 504, 560, 504,
+};
+
+static const uint16_t helvetica_bold_widths[256] = {
+ 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280,
+ 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280,
+ 280, 280, 280, 280, 280, 335, 477, 560, 560, 896, 727, 239, 335, 335,
+ 392, 588, 280, 335, 280, 280, 560, 560, 560, 560, 560, 560, 560, 560,
+ 560, 560, 335, 335, 588, 588, 588, 615, 982, 727, 727, 727, 727, 672,
+ 615, 784, 727, 280, 560, 727, 615, 839, 727, 784, 672, 784, 727, 672,
+ 615, 727, 672, 951, 672, 672, 615, 335, 280, 335, 588, 560, 335, 560,
+ 615, 560, 615, 560, 335, 615, 615, 280, 280, 560, 280, 896, 615, 615,
+ 615, 615, 392, 560, 335, 615, 560, 784, 560, 560, 504, 392, 282, 392,
+ 588, 352, 560, 352, 280, 560, 504, 1008, 560, 560, 335, 1008, 672, 335,
+ 1008, 352, 615, 352, 352, 280, 280, 504, 504, 352, 560, 1008, 335, 1008,
+ 560, 335, 951, 352, 504, 672, 280, 335, 560, 560, 560, 560, 282, 560,
+ 335, 742, 372, 560, 588, 335, 742, 335, 403, 588, 335, 335, 335, 615,
+ 560, 280, 335, 335, 367, 560, 840, 840, 840, 615, 727, 727, 727, 727,
+ 727, 727, 1008, 727, 672, 672, 672, 672, 280, 280, 280, 280, 727, 727,
+ 784, 784, 784, 784, 784, 588, 784, 727, 727, 727, 727, 672, 672, 615,
+ 560, 560, 560, 560, 560, 560, 896, 560, 560, 560, 560, 560, 280, 280,
+ 280, 280, 615, 615, 615, 615, 615, 615, 615, 588, 615, 615, 615, 615,
+ 615, 560, 615, 560,
+};
+
+static const uint16_t helvetica_bold_oblique_widths[256] = {
+ 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280,
+ 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280,
+ 280, 280, 280, 280, 280, 335, 477, 560, 560, 896, 727, 239, 335, 335,
+ 392, 588, 280, 335, 280, 280, 560, 560, 560, 560, 560, 560, 560, 560,
+ 560, 560, 335, 335, 588, 588, 588, 615, 982, 727, 727, 727, 727, 672,
+ 615, 784, 727, 280, 560, 727, 615, 839, 727, 784, 672, 784, 727, 672,
+ 615, 727, 672, 951, 672, 672, 615, 335, 280, 335, 588, 560, 335, 560,
+ 615, 560, 615, 560, 335, 615, 615, 280, 280, 560, 280, 896, 615, 615,
+ 615, 615, 392, 560, 335, 615, 560, 784, 560, 560, 504, 392, 282, 392,
+ 588, 352, 560, 352, 280, 560, 504, 1008, 560, 560, 335, 1008, 672, 335,
+ 1008, 352, 615, 352, 352, 280, 280, 504, 504, 352, 560, 1008, 335, 1008,
+ 560, 335, 951, 352, 504, 672, 280, 335, 560, 560, 560, 560, 282, 560,
+ 335, 742, 372, 560, 588, 335, 742, 335, 403, 588, 335, 335, 335, 615,
+ 560, 280, 335, 335, 367, 560, 840, 840, 840, 615, 727, 727, 727, 727,
+ 727, 727, 1008, 727, 672, 672, 672, 672, 280, 280, 280, 280, 727, 727,
+ 784, 784, 784, 784, 784, 588, 784, 727, 727, 727, 727, 672, 672, 615,
+ 560, 560, 560, 560, 560, 560, 896, 560, 560, 560, 560, 560, 280, 280,
+ 280, 280, 615, 615, 615, 615, 615, 615, 615, 588, 615, 615, 615, 615,
+ 615, 560, 615, 560,
+};
+
+static const uint16_t helvetica_oblique_widths[256] = {
+ 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280,
+ 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280,
+ 280, 280, 280, 280, 280, 280, 280, 280, 357, 560, 560, 896, 672,
+ 192, 335, 335, 392, 588, 280, 335, 280, 280, 560, 560, 560, 560,
+ 560, 560, 560, 560, 560, 560, 280, 280, 588, 588, 588, 560, 1023,
+ 672, 672, 727, 727, 672, 615, 784, 727, 280, 504, 672, 560, 839,
+ 727, 784, 672, 784, 727, 672, 615, 727, 672, 951, 672, 672, 615,
+ 280, 280, 280, 472, 560, 335, 560, 560, 504, 560, 560, 280, 560,
+ 560, 223, 223, 504, 223, 839, 560, 560, 560, 560, 335, 504, 280,
+ 560, 504, 727, 504, 504, 504, 336, 262, 336, 588, 352, 560, 352,
+ 223, 560, 335, 1008, 560, 560, 335, 1008, 672, 335, 1008, 352, 615,
+ 352, 352, 223, 223, 335, 335, 352, 560, 1008, 335, 1008, 504, 335,
+ 951, 352, 504, 672, 280, 335, 560, 560, 560, 560, 262, 560, 335,
+ 742, 372, 560, 588, 335, 742, 335, 403, 588, 335, 335, 335, 560,
+ 541, 280, 335, 335, 367, 560, 840, 840, 840, 615, 672, 672, 672,
+ 672, 672, 672, 1008, 727, 672, 672, 672, 672, 280, 280, 280, 280,
+ 727, 727, 784, 784, 784, 784, 784, 588, 784, 727, 727, 727, 727,
+ 672, 672, 615, 560, 560, 560, 560, 560, 560, 896, 504, 560, 560,
+ 560, 560, 280, 280, 280, 280, 560, 560, 560, 560, 560, 560, 560,
+ 588, 615, 560, 560, 560, 560, 504, 560, 504,
+};
+
+static const uint16_t symbol_widths[256] = {
+ 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+ 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+ 252, 252, 252, 252, 252, 335, 718, 504, 553, 839, 784, 442, 335, 335,
+ 504, 553, 252, 553, 252, 280, 504, 504, 504, 504, 504, 504, 504, 504,
+ 504, 504, 280, 280, 553, 553, 553, 447, 553, 727, 672, 727, 616, 615,
+ 769, 607, 727, 335, 636, 727, 691, 896, 727, 727, 774, 746, 560, 596,
+ 615, 695, 442, 774, 650, 801, 615, 335, 869, 335, 663, 504, 504, 636,
+ 553, 553, 497, 442, 525, 414, 607, 331, 607, 553, 553, 580, 525, 553,
+ 553, 525, 553, 607, 442, 580, 718, 691, 496, 691, 497, 483, 201, 483,
+ 553, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 756, 624, 248, 553, 168, 718, 504, 759,
+ 759, 759, 759, 1050, 994, 607, 994, 607, 403, 553, 414, 553, 553, 718,
+ 497, 463, 553, 553, 553, 553, 1008, 607, 1008, 663, 829, 691, 801, 994,
+ 774, 774, 829, 774, 774, 718, 718, 718, 718, 718, 718, 718, 774, 718,
+ 796, 796, 897, 829, 553, 252, 718, 607, 607, 1050, 994, 607, 994, 607,
+ 497, 331, 796, 796, 792, 718, 387, 387, 387, 387, 387, 387, 497, 497,
+ 497, 497, 0, 331, 276, 691, 691, 691, 387, 387, 387, 387, 387, 387,
+ 497, 497, 497, 0,
+};
+
+static const uint16_t times_widths[256] = {
+ 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+ 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+ 252, 252, 252, 252, 252, 335, 411, 504, 504, 839, 784, 181, 335, 335,
+ 504, 568, 252, 335, 252, 280, 504, 504, 504, 504, 504, 504, 504, 504,
+ 504, 504, 280, 280, 568, 568, 568, 447, 928, 727, 672, 672, 727, 615,
+ 560, 727, 727, 335, 392, 727, 615, 896, 727, 727, 560, 727, 672, 560,
+ 615, 727, 727, 951, 727, 727, 615, 335, 280, 335, 472, 504, 335, 447,
+ 504, 447, 504, 447, 335, 504, 504, 280, 280, 504, 280, 784, 504, 504,
+ 504, 504, 335, 392, 280, 504, 504, 727, 504, 504, 447, 483, 201, 483,
+ 545, 352, 504, 352, 335, 504, 447, 1008, 504, 504, 335, 1008, 560, 335,
+ 896, 352, 615, 352, 352, 335, 335, 447, 447, 352, 504, 1008, 335, 987,
+ 392, 335, 727, 352, 447, 727, 252, 335, 504, 504, 504, 504, 201, 504,
+ 335, 766, 278, 504, 568, 335, 766, 335, 403, 568, 302, 302, 335, 504,
+ 456, 252, 335, 302, 312, 504, 756, 756, 756, 447, 727, 727, 727, 727,
+ 727, 727, 896, 672, 615, 615, 615, 615, 335, 335, 335, 335, 727, 727,
+ 727, 727, 727, 727, 727, 568, 727, 727, 727, 727, 727, 727, 560, 504,
+ 447, 447, 447, 447, 447, 447, 672, 447, 447, 447, 447, 447, 280, 280,
+ 280, 280, 504, 504, 504, 504, 504, 504, 504, 568, 504, 504, 504, 504,
+ 504, 504, 504, 504,
+};
+
+static const uint16_t times_bold_widths[256] = {
+ 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+ 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+ 252, 252, 252, 252, 252, 252, 252, 335, 559, 504, 504, 1008, 839,
+ 280, 335, 335, 504, 574, 252, 335, 252, 280, 504, 504, 504, 504,
+ 504, 504, 504, 504, 504, 504, 335, 335, 574, 574, 574, 504, 937,
+ 727, 672, 727, 727, 672, 615, 784, 784, 392, 504, 784, 672, 951,
+ 727, 784, 615, 784, 727, 560, 672, 727, 727, 1008, 727, 727, 672,
+ 335, 280, 335, 585, 504, 335, 504, 560, 447, 560, 447, 335, 504,
+ 560, 280, 335, 560, 280, 839, 560, 504, 560, 560, 447, 392, 335,
+ 560, 504, 727, 504, 504, 447, 397, 221, 397, 524, 352, 504, 352,
+ 335, 504, 504, 1008, 504, 504, 335, 1008, 560, 335, 1008, 352, 672,
+ 352, 352, 335, 335, 504, 504, 352, 504, 1008, 335, 1008, 392, 335,
+ 727, 352, 447, 727, 252, 335, 504, 504, 504, 504, 221, 504, 335,
+ 752, 302, 504, 574, 335, 752, 335, 403, 574, 302, 302, 335, 560,
+ 544, 252, 335, 302, 332, 504, 756, 756, 756, 504, 727, 727, 727,
+ 727, 727, 727, 1008, 727, 672, 672, 672, 672, 392, 392, 392, 392,
+ 727, 727, 784, 784, 784, 784, 784, 574, 784, 727, 727, 727, 727,
+ 727, 615, 560, 504, 504, 504, 504, 504, 504, 727, 447, 447, 447,
+ 447, 447, 280, 280, 280, 280, 504, 560, 504, 504, 504, 504, 504,
+ 574, 504, 560, 560, 560, 560, 504, 560, 504,
+};
+
+static const uint16_t times_bold_italic_widths[256] = {
+ 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+ 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+ 252, 252, 252, 252, 252, 392, 559, 504, 504, 839, 784, 280, 335, 335,
+ 504, 574, 252, 335, 252, 280, 504, 504, 504, 504, 504, 504, 504, 504,
+ 504, 504, 335, 335, 574, 574, 574, 504, 838, 672, 672, 672, 727, 672,
+ 672, 727, 784, 392, 504, 672, 615, 896, 727, 727, 615, 727, 672, 560,
+ 615, 727, 672, 896, 672, 615, 615, 335, 280, 335, 574, 504, 335, 504,
+ 504, 447, 504, 447, 335, 504, 560, 280, 280, 504, 280, 784, 560, 504,
+ 504, 504, 392, 392, 280, 560, 447, 672, 504, 447, 392, 350, 221, 350,
+ 574, 352, 504, 352, 335, 504, 504, 1008, 504, 504, 335, 1008, 560, 335,
+ 951, 352, 615, 352, 352, 335, 335, 504, 504, 352, 504, 1008, 335, 1008,
+ 392, 335, 727, 352, 392, 615, 252, 392, 504, 504, 504, 504, 221, 504,
+ 335, 752, 268, 504, 610, 335, 752, 335, 403, 574, 302, 302, 335, 580,
+ 504, 252, 335, 302, 302, 504, 756, 756, 756, 504, 672, 672, 672, 672,
+ 672, 672, 951, 672, 672, 672, 672, 672, 392, 392, 392, 392, 727, 727,
+ 727, 727, 727, 727, 727, 574, 727, 727, 727, 727, 727, 615, 615, 504,
+ 504, 504, 504, 504, 504, 504, 727, 447, 447, 447, 447, 447, 280, 280,
+ 280, 280, 504, 560, 504, 504, 504, 504, 504, 574, 504, 560, 560, 560,
+ 560, 447, 504, 447,
+};
+
+static const uint16_t times_italic_widths[256] = {
+ 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+ 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+ 252, 252, 252, 252, 252, 335, 423, 504, 504, 839, 784, 215, 335, 335,
+ 504, 680, 252, 335, 252, 280, 504, 504, 504, 504, 504, 504, 504, 504,
+ 504, 504, 335, 335, 680, 680, 680, 504, 927, 615, 615, 672, 727, 615,
+ 615, 727, 727, 335, 447, 672, 560, 839, 672, 727, 615, 727, 615, 504,
+ 560, 727, 615, 839, 615, 560, 560, 392, 280, 392, 425, 504, 335, 504,
+ 504, 447, 504, 447, 280, 504, 504, 280, 280, 447, 280, 727, 504, 504,
+ 504, 504, 392, 392, 280, 504, 447, 672, 447, 447, 392, 403, 277, 403,
+ 545, 352, 504, 352, 335, 504, 560, 896, 504, 504, 335, 1008, 504, 335,
+ 951, 352, 560, 352, 352, 335, 335, 560, 560, 352, 504, 896, 335, 987,
+ 392, 335, 672, 352, 392, 560, 252, 392, 504, 504, 504, 504, 277, 504,
+ 335, 766, 278, 504, 680, 335, 766, 335, 403, 680, 302, 302, 335, 504,
+ 527, 252, 335, 302, 312, 504, 756, 756, 756, 504, 615, 615, 615, 615,
+ 615, 615, 896, 672, 615, 615, 615, 615, 335, 335, 335, 335, 727, 672,
+ 727, 727, 727, 727, 727, 680, 727, 727, 727, 727, 727, 560, 615, 504,
+ 504, 504, 504, 504, 504, 504, 672, 447, 447, 447, 447, 447, 280, 280,
+ 280, 280, 504, 504, 504, 504, 504, 504, 504, 680, 504, 504, 504, 504,
+ 504, 447, 504, 447,
+};
+
+static const uint16_t zapfdingbats_widths[256] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 280, 981, 968, 981, 987, 724, 795, 796, 797, 695,
+ 967, 946, 553, 861, 918, 940, 918, 952, 981, 761, 852, 768, 767, 575,
+ 682, 769, 766, 765, 760, 497, 556, 541, 581, 697, 792, 794, 794, 796,
+ 799, 800, 822, 829, 795, 847, 829, 839, 822, 837, 930, 749, 728, 754,
+ 796, 798, 700, 782, 774, 798, 765, 712, 713, 687, 706, 832, 821, 795,
+ 795, 712, 692, 701, 694, 792, 793, 718, 797, 791, 797, 879, 767, 768,
+ 768, 765, 765, 899, 899, 794, 790, 441, 139, 279, 418, 395, 395, 673,
+ 673, 0, 393, 393, 319, 319, 278, 278, 513, 513, 413, 413, 235, 235,
+ 336, 336, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 737, 548, 548, 917, 672, 766, 766,
+ 782, 599, 699, 631, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794,
+ 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794,
+ 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794,
+ 794, 794, 901, 844, 1024, 461, 753, 931, 753, 925, 934, 935, 935, 840,
+ 879, 834, 931, 931, 924, 937, 938, 466, 890, 842, 842, 873, 873, 701,
+ 701, 880, 0, 880, 766, 953, 777, 871, 777, 895, 974, 895, 837, 879,
+ 934, 977, 925, 0,
+};
+
+static const uint16_t courier_widths[256] = {
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604,
+ 604,
+};
+
+static int pdf_text_point_width(struct pdf_doc *pdf, const char *text,
+ ptrdiff_t text_len, float size,
+ const uint16_t *widths, float *point_width)
+{
+ uint32_t len = 0;
+ if (text_len < 0)
+ text_len = strlen(text);
+ *point_width = 0.0f;
+
+ for (int i = 0; i < (int)text_len;) {
+ uint8_t pdf_char = 0;
+ int code_len;
+ code_len =
+ utf8_to_pdfencoding(pdf, &text[i], text_len - i, &pdf_char);
+ if (code_len < 0)
+ return pdf_set_err(pdf, code_len,
+ "Invalid unicode string at position %d in %s",
+ i, text);
+ i += code_len;
+
+ if (pdf_char != '\n' && pdf_char != '\r')
+ len += widths[pdf_char];
+ }
+
+ /* Our widths arrays are for 14pt fonts */
+ *point_width = len * size / (14.0f * 72.0f);
+
+ return 0;
+}
+
+static const uint16_t *find_font_widths(const char *font_name)
+{
+ if (strcasecmp(font_name, "Helvetica") == 0)
+ return helvetica_widths;
+ if (strcasecmp(font_name, "Helvetica-Bold") == 0)
+ return helvetica_bold_widths;
+ if (strcasecmp(font_name, "Helvetica-BoldOblique") == 0)
+ return helvetica_bold_oblique_widths;
+ if (strcasecmp(font_name, "Helvetica-Oblique") == 0)
+ return helvetica_oblique_widths;
+ if (strcasecmp(font_name, "Courier") == 0 ||
+ strcasecmp(font_name, "Courier-Bold") == 0 ||
+ strcasecmp(font_name, "Courier-BoldOblique") == 0 ||
+ strcasecmp(font_name, "Courier-Oblique") == 0)
+ return courier_widths;
+ if (strcasecmp(font_name, "Times-Roman") == 0)
+ return times_widths;
+ if (strcasecmp(font_name, "Times-Bold") == 0)
+ return times_bold_widths;
+ if (strcasecmp(font_name, "Times-Italic") == 0)
+ return times_italic_widths;
+ if (strcasecmp(font_name, "Times-BoldItalic") == 0)
+ return times_bold_italic_widths;
+ if (strcasecmp(font_name, "Symbol") == 0)
+ return symbol_widths;
+ if (strcasecmp(font_name, "ZapfDingbats") == 0)
+ return zapfdingbats_widths;
+
+ return NULL;
+}
+
+int pdf_get_font_text_width(struct pdf_doc *pdf, const char *font_name,
+ const char *text, float size, float *text_width)
+{
+ if (!font_name)
+ font_name = pdf->current_font->font.name;
+ const uint16_t *widths = find_font_widths(font_name);
+
+ if (!widths)
+ return pdf_set_err(pdf, -EINVAL,
+ "Unable to determine width for font '%s'",
+ pdf->current_font->font.name);
+ return pdf_text_point_width(pdf, text, -1, size, widths, text_width);
+}
+
+static const char *find_word_break(const char *string)
+{
+ /* Skip over the actual word */
+ while (string && *string && (*string < 0 || !isspace(*string)))
+ string++;
+
+ return string;
+}
+
+int pdf_add_text_wrap(struct pdf_doc *pdf, struct pdf_object *page,
+ const char *text, float size, float xoff, float yoff,
+ uint32_t colour, float wrap_width, int align,
+ float *height)
+{
+ /* Move through the text string, stopping at word boundaries,
+ * trying to find the longest text string we can fit in the given width
+ */
+ const char *start = text;
+ const char *last_best = text;
+ const char *end = text;
+ char line[512];
+ const uint16_t *widths;
+ float orig_yoff = yoff;
+
+ widths = find_font_widths(pdf->current_font->font.name);
+ if (!widths)
+ return pdf_set_err(pdf, -EINVAL,
+ "Unable to determine width for font '%s'",
+ pdf->current_font->font.name);
+
+ while (start && *start) {
+ const char *new_end = find_word_break(end + 1);
+ float line_width;
+ int output = 0;
+ float xoff_align = xoff;
+ int e;
+
+ end = new_end;
+
+ e = pdf_text_point_width(pdf, start, end - start, size, widths,
+ &line_width);
+ if (e < 0)
+ return e;
+
+ if (line_width >= wrap_width) {
+ if (last_best == start) {
+ /* There is a single word that is too long for the line */
+ ptrdiff_t i;
+ /* Find the best character to chop it at */
+ for (i = end - start - 1; i > 0; i--) {
+ float this_width;
+ // Don't look at places that are in the middle of a utf-8
+ // sequence
+ if ((start[i - 1] & 0xc0) == 0xc0 ||
+ ((start[i - 1] & 0xc0) == 0x80 &&
+ (start[i] & 0xc0) == 0x80))
+ continue;
+ e = pdf_text_point_width(pdf, start, i, size, widths,
+ &this_width);
+ if (e < 0)
+ return e;
+ if (this_width < wrap_width)
+ break;
+ }
+ if (i == 0)
+ return pdf_set_err(pdf, -EINVAL,
+ "Unable to find suitable line break");
+
+ end = start + i;
+ } else
+ end = last_best;
+ output = 1;
+ }
+ if (*end == '\0')
+ output = 1;
+
+ if (*end == '\n' || *end == '\r')
+ output = 1;
+
+ if (output) {
+ int len = end - start;
+ float char_spacing = 0;
+ if (len >= (int)sizeof(line))
+ len = (int)sizeof(line) - 1;
+ strncpy(line, start, len);
+ line[len] = '\0';
+
+ e = pdf_text_point_width(pdf, start, len, size, widths,
+ &line_width);
+ if (e < 0)
+ return e;
+
+ switch (align) {
+ case PDF_ALIGN_RIGHT:
+ xoff_align += wrap_width - line_width;
+ break;
+ case PDF_ALIGN_CENTER:
+ xoff_align += (wrap_width - line_width) / 2;
+ break;
+ case PDF_ALIGN_JUSTIFY:
+ if ((len - 1) > 0 && *end != '\r' && *end != '\n' &&
+ *end != '\0')
+ char_spacing = (wrap_width - line_width) / (len - 2);
+ break;
+ case PDF_ALIGN_JUSTIFY_ALL:
+ if ((len - 1) > 0)
+ char_spacing = (wrap_width - line_width) / (len - 2);
+ break;
+ }
+
+ if (align != PDF_ALIGN_NO_WRITE) {
+ pdf_add_text_spacing(pdf, page, line, size, xoff_align, yoff,
+ colour, char_spacing);
+ }
+
+ if (*end == ' ')
+ end++;
+
+ start = last_best = end;
+ yoff -= size;
+ } else
+ last_best = end;
+ }
+
+ if (height)
+ *height = orig_yoff - yoff;
+ return 0;
+}
+
+int pdf_add_line(struct pdf_doc *pdf, struct pdf_object *page, float x1,
+ float y1, float x2, float y2, float width, uint32_t colour)
+{
+ int ret;
+ struct dstr str = INIT_DSTR;
+
+ dstr_printf(&str, "%f w\r\n", width);
+ dstr_printf(&str, "%f %f m\r\n", x1, y1);
+ dstr_printf(&str, "/DeviceRGB CS\r\n");
+ dstr_printf(&str, "%f %f %f RG\r\n", PDF_RGB_R(colour), PDF_RGB_G(colour),
+ PDF_RGB_B(colour));
+ dstr_printf(&str, "%f %f l S\r\n", x2, y2);
+
+ ret = pdf_add_stream(pdf, page, dstr_data(&str));
+ dstr_free(&str);
+
+ return ret;
+}
+
+int pdf_add_cubic_bezier(struct pdf_doc *pdf, struct pdf_object *page,
+ float x1, float y1, float x2, float y2, float xq1,
+ float yq1, float xq2, float yq2, float width,
+ uint32_t colour)
+{
+ int ret;
+ struct dstr str = INIT_DSTR;
+
+ dstr_printf(&str, "%f w\r\n", width);
+ dstr_printf(&str, "%f %f m\r\n", x1, y1);
+ dstr_printf(&str, "/DeviceRGB CS\r\n");
+ dstr_printf(&str, "%f %f %f RG\r\n", PDF_RGB_R(colour), PDF_RGB_G(colour),
+ PDF_RGB_B(colour));
+ dstr_printf(&str, "%f %f %f %f %f %f c S\r\n", xq1, yq1, xq2, yq2, x2,
+ y2);
+
+ ret = pdf_add_stream(pdf, page, dstr_data(&str));
+ dstr_free(&str);
+
+ return ret;
+}
+
+int pdf_add_quadratic_bezier(struct pdf_doc *pdf, struct pdf_object *page,
+ float x1, float y1, float x2, float y2,
+ float xq1, float yq1, float width,
+ uint32_t colour)
+{
+ float xc1 = x1 + (xq1 - x1) * (2.0f / 3.0f);
+ float yc1 = y1 + (yq1 - y1) * (2.0f / 3.0f);
+ float xc2 = x2 + (xq1 - x2) * (2.0f / 3.0f);
+ float yc2 = y2 + (yq1 - y2) * (2.0f / 3.0f);
+ return pdf_add_cubic_bezier(pdf, page, x1, y1, x2, y2, xc1, yc1, xc2, yc2,
+ width, colour);
+}
+
+int pdf_add_custom_path(struct pdf_doc *pdf, struct pdf_object *page,
+ struct pdf_path_operation *operations,
+ int operation_count, float stroke_width,
+ uint32_t stroke_colour, uint32_t fill_colour)
+{
+ int ret;
+ struct dstr str = INIT_DSTR;
+
+ if (!PDF_IS_TRANSPARENT(fill_colour)) {
+ dstr_printf(&str, "/DeviceRGB CS\r\n");
+ dstr_printf(&str, "%f %f %f rg\r\n", PDF_RGB_R(fill_colour),
+ PDF_RGB_G(fill_colour), PDF_RGB_B(fill_colour));
+ }
+ dstr_printf(&str, "%f w\r\n", stroke_width);
+ dstr_printf(&str, "/DeviceRGB CS\r\n");
+ dstr_printf(&str, "%f %f %f RG\r\n", PDF_RGB_R(stroke_colour),
+ PDF_RGB_G(stroke_colour), PDF_RGB_B(stroke_colour));
+
+ for (int i = 0; i < operation_count; i++) {
+ struct pdf_path_operation operation = operations[i];
+ switch (operation.op) {
+ case 'm':
+ dstr_printf(&str, "%f %f m\r\n", operation.x1, operation.y1);
+ break;
+ case 'l':
+ dstr_printf(&str, "%f %f l\r\n", operation.x1, operation.y1);
+ break;
+ case 'c':
+ dstr_printf(&str, "%f %f %f %f %f %f c\r\n", operation.x1,
+ operation.y1, operation.x2, operation.y2,
+ operation.x3, operation.y3);
+ break;
+ case 'v':
+ dstr_printf(&str, "%f %f %f %f v\r\n", operation.x1, operation.y1,
+ operation.x2, operation.y2);
+ break;
+ case 'y':
+ dstr_printf(&str, "%f %f %f %f y\r\n", operation.x1, operation.y1,
+ operation.x2, operation.y2);
+ break;
+ case 'h':
+ dstr_printf(&str, "h\r\n");
+ break;
+ default:
+ return pdf_set_err(pdf, -errno, "Invalid operation");
+ break;
+ }
+ }
+
+ if (PDF_IS_TRANSPARENT(fill_colour))
+ dstr_printf(&str, "%s", "S ");
+ else
+ dstr_printf(&str, "%s", "B ");
+ ret = pdf_add_stream(pdf, page, dstr_data(&str));
+ dstr_free(&str);
+
+ return ret;
+}
+
+int pdf_add_ellipse(struct pdf_doc *pdf, struct pdf_object *page, float x,
+ float y, float xradius, float yradius, float width,
+ uint32_t colour, uint32_t fill_colour)
+{
+ int ret;
+ struct dstr str = INIT_DSTR;
+ float lx, ly;
+
+ lx = (4.0f / 3.0f) * (M_SQRT2 - 1) * xradius;
+ ly = (4.0f / 3.0f) * (M_SQRT2 - 1) * yradius;
+
+ if (!PDF_IS_TRANSPARENT(fill_colour)) {
+ dstr_printf(&str, "/DeviceRGB CS\r\n");
+ dstr_printf(&str, "%f %f %f rg\r\n", PDF_RGB_R(fill_colour),
+ PDF_RGB_G(fill_colour), PDF_RGB_B(fill_colour));
+ }
+
+ /* stroke color */
+ dstr_printf(&str, "/DeviceRGB CS\r\n");
+ dstr_printf(&str, "%f %f %f RG\r\n", PDF_RGB_R(colour), PDF_RGB_G(colour),
+ PDF_RGB_B(colour));
+
+ dstr_printf(&str, "%f w ", width);
+
+ dstr_printf(&str, "%.2f %.2f m ", (x + xradius), (y));
+
+ dstr_printf(&str, "%.2f %.2f %.2f %.2f %.2f %.2f c ", (x + xradius),
+ (y - ly), (x + lx), (y - yradius), x, (y - yradius));
+
+ dstr_printf(&str, "%.2f %.2f %.2f %.2f %.2f %.2f c ", (x - lx),
+ (y - yradius), (x - xradius), (y - ly), (x - xradius), y);
+
+ dstr_printf(&str, "%.2f %.2f %.2f %.2f %.2f %.2f c ", (x - xradius),
+ (y + ly), (x - lx), (y + yradius), x, (y + yradius));
+
+ dstr_printf(&str, "%.2f %.2f %.2f %.2f %.2f %.2f c ", (x + lx),
+ (y + yradius), (x + xradius), (y + ly), (x + xradius), y);
+
+ if (PDF_IS_TRANSPARENT(fill_colour))
+ dstr_printf(&str, "%s", "S ");
+ else
+ dstr_printf(&str, "%s", "B ");
+
+ ret = pdf_add_stream(pdf, page, dstr_data(&str));
+ dstr_free(&str);
+
+ return ret;
+}
+
+int pdf_add_circle(struct pdf_doc *pdf, struct pdf_object *page, float xr,
+ float yr, float radius, float width, uint32_t colour,
+ uint32_t fill_colour)
+{
+ return pdf_add_ellipse(pdf, page, xr, yr, radius, radius, width, colour,
+ fill_colour);
+}
+
+int pdf_add_rectangle(struct pdf_doc *pdf, struct pdf_object *page, float x,
+ float y, float width, float height, float border_width,
+ uint32_t colour)
+{
+ int ret;
+ struct dstr str = INIT_DSTR;
+
+ dstr_printf(&str, "%f %f %f RG ", PDF_RGB_R(colour), PDF_RGB_G(colour),
+ PDF_RGB_B(colour));
+ dstr_printf(&str, "%f w ", border_width);
+ dstr_printf(&str, "%f %f %f %f re S ", x, y, width, height);
+
+ ret = pdf_add_stream(pdf, page, dstr_data(&str));
+ dstr_free(&str);
+
+ return ret;
+}
+
+int pdf_add_filled_rectangle(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float width, float height,
+ float border_width, uint32_t colour_fill,
+ uint32_t colour_border)
+{
+ int ret;
+ struct dstr str = INIT_DSTR;
+
+ dstr_printf(&str, "%f %f %f rg ", PDF_RGB_R(colour_fill),
+ PDF_RGB_G(colour_fill), PDF_RGB_B(colour_fill));
+ if (border_width > 0) {
+ dstr_printf(&str, "%f %f %f RG ", PDF_RGB_R(colour_border),
+ PDF_RGB_G(colour_border), PDF_RGB_B(colour_border));
+ dstr_printf(&str, "%f w ", border_width);
+ dstr_printf(&str, "%f %f %f %f re B ", x, y, width, height);
+ } else {
+ dstr_printf(&str, "%f %f %f %f re f ", x, y, width, height);
+ }
+
+ ret = pdf_add_stream(pdf, page, dstr_data(&str));
+ dstr_free(&str);
+
+ return ret;
+}
+
+int pdf_add_polygon(struct pdf_doc *pdf, struct pdf_object *page, float x[],
+ float y[], int count, float border_width, uint32_t colour)
+{
+ int ret;
+ struct dstr str = INIT_DSTR;
+
+ dstr_printf(&str, "%f %f %f RG ", PDF_RGB_R(colour), PDF_RGB_G(colour),
+ PDF_RGB_B(colour));
+ dstr_printf(&str, "%f w ", border_width);
+ dstr_printf(&str, "%f %f m ", x[0], y[0]);
+ for (int i = 1; i < count; i++) {
+ dstr_printf(&str, "%f %f l ", x[i], y[i]);
+ }
+ dstr_printf(&str, "h S ");
+
+ ret = pdf_add_stream(pdf, page, dstr_data(&str));
+ dstr_free(&str);
+
+ return ret;
+}
+
+int pdf_add_filled_polygon(struct pdf_doc *pdf, struct pdf_object *page,
+ float x[], float y[], int count,
+ float border_width, uint32_t colour)
+{
+ int ret;
+ struct dstr str = INIT_DSTR;
+
+ dstr_printf(&str, "%f %f %f RG ", PDF_RGB_R(colour), PDF_RGB_G(colour),
+ PDF_RGB_B(colour));
+ dstr_printf(&str, "%f %f %f rg ", PDF_RGB_R(colour), PDF_RGB_G(colour),
+ PDF_RGB_B(colour));
+ dstr_printf(&str, "%f w ", border_width);
+ dstr_printf(&str, "%f %f m ", x[0], y[0]);
+ for (int i = 1; i < count; i++) {
+ dstr_printf(&str, "%f %f l ", x[i], y[i]);
+ }
+ dstr_printf(&str, "h f ");
+
+ ret = pdf_add_stream(pdf, page, dstr_data(&str));
+ dstr_free(&str);
+
+ return ret;
+}
+
+static const struct {
+ uint32_t code;
+ char ch;
+} code_128a_encoding[] = {
+ {0x212222, ' '}, {0x222122, '!'}, {0x222221, '"'}, {0x121223, '#'},
+ {0x121322, '$'}, {0x131222, '%'}, {0x122213, '&'}, {0x122312, '\''},
+ {0x132212, '('}, {0x221213, ')'}, {0x221312, '*'}, {0x231212, '+'},
+ {0x112232, ','}, {0x122132, '-'}, {0x122231, '.'}, {0x113222, '/'},
+ {0x123122, '0'}, {0x123221, '1'}, {0x223211, '2'}, {0x221132, '3'},
+ {0x221231, '4'}, {0x213212, '5'}, {0x223112, '6'}, {0x312131, '7'},
+ {0x311222, '8'}, {0x321122, '9'}, {0x321221, ':'}, {0x312212, ';'},
+ {0x322112, '<'}, {0x322211, '='}, {0x212123, '>'}, {0x212321, '?'},
+ {0x232121, '@'}, {0x111323, 'A'}, {0x131123, 'B'}, {0x131321, 'C'},
+ {0x112313, 'D'}, {0x132113, 'E'}, {0x132311, 'F'}, {0x211313, 'G'},
+ {0x231113, 'H'}, {0x231311, 'I'}, {0x112133, 'J'}, {0x112331, 'K'},
+ {0x132131, 'L'}, {0x113123, 'M'}, {0x113321, 'N'}, {0x133121, 'O'},
+ {0x313121, 'P'}, {0x211331, 'Q'}, {0x231131, 'R'}, {0x213113, 'S'},
+ {0x213311, 'T'}, {0x213131, 'U'}, {0x311123, 'V'}, {0x311321, 'W'},
+ {0x331121, 'X'}, {0x312113, 'Y'}, {0x312311, 'Z'}, {0x332111, '['},
+ {0x314111, '\\'}, {0x221411, ']'}, {0x431111, '^'}, {0x111224, '_'},
+ {0x111422, '`'}, {0x121124, 'a'}, {0x121421, 'b'}, {0x141122, 'c'},
+ {0x141221, 'd'}, {0x112214, 'e'}, {0x112412, 'f'}, {0x122114, 'g'},
+ {0x122411, 'h'}, {0x142112, 'i'}, {0x142211, 'j'}, {0x241211, 'k'},
+ {0x221114, 'l'}, {0x413111, 'm'}, {0x241112, 'n'}, {0x134111, 'o'},
+ {0x111242, 'p'}, {0x121142, 'q'}, {0x121241, 'r'}, {0x114212, 's'},
+ {0x124112, 't'}, {0x124211, 'u'}, {0x411212, 'v'}, {0x421112, 'w'},
+ {0x421211, 'x'}, {0x212141, 'y'}, {0x214121, 'z'}, {0x412121, '{'},
+ {0x111143, '|'}, {0x111341, '}'}, {0x131141, '~'}, {0x114113, '\0'},
+ {0x114311, '\0'}, {0x411113, '\0'}, {0x411311, '\0'}, {0x113141, '\0'},
+ {0x114131, '\0'}, {0x311141, '\0'}, {0x411131, '\0'}, {0x211412, '\0'},
+ {0x211214, '\0'}, {0x211232, '\0'}, {0x2331112, '\0'},
+};
+
+static int find_128_encoding(char ch)
+{
+ for (int i = 0; i < (int)ARRAY_SIZE(code_128a_encoding); i++) {
+ if (code_128a_encoding[i].ch == ch)
+ return i;
+ }
+ return -1;
+}
+
+static float pdf_barcode_128a_ch(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float width, float height,
+ uint32_t colour, int index, int code_len)
+{
+ uint32_t code = code_128a_encoding[index].code;
+ float line_width = width / 11.0f;
+
+ for (int i = 0; i < code_len; i++) {
+ uint8_t shift = (code_len - 1 - i) * 4;
+ uint8_t mask = (code >> shift) & 0xf;
+
+ if (!(i % 2))
+ pdf_add_filled_rectangle(pdf, page, x, y, line_width * mask,
+ height, 0, colour, PDF_TRANSPARENT);
+ x += line_width * mask;
+ }
+ return x;
+}
+
+static int pdf_add_barcode_128a(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float width, float height,
+ const char *string, uint32_t colour)
+{
+ const char *s;
+ size_t len = strlen(string) + 3;
+ float char_width = width / len;
+ int checksum, i;
+
+ if (char_width / 11.0f <= 0)
+ return pdf_set_err(pdf, -EINVAL,
+ "Insufficient width to draw barcode");
+
+ for (s = string; *s; s++)
+ if (find_128_encoding(*s) < 0)
+ return pdf_set_err(pdf, -EINVAL, "Invalid barcode character 0x%x",
+ *s);
+
+ x = pdf_barcode_128a_ch(pdf, page, x, y, char_width, height, colour, 104,
+ 6);
+ checksum = 104;
+
+ for (i = 1, s = string; *s; s++, i++) {
+ int index = find_128_encoding(*s);
+ // This should be impossible, due to the checks above, but confirm
+ // here anyway to stop coverity complaining
+ if (index < 0)
+ return pdf_set_err(pdf, -EINVAL,
+ "Invalid 128a barcode character 0x%x", *s);
+ x = pdf_barcode_128a_ch(pdf, page, x, y, char_width, height, colour,
+ index, 6);
+ checksum += index * i;
+ }
+ x = pdf_barcode_128a_ch(pdf, page, x, y, char_width, height, colour,
+ checksum % 103, 6);
+ pdf_barcode_128a_ch(pdf, page, x, y, char_width, height, colour, 106, 7);
+ return 0;
+}
+
+/* Code 39 character encoding. Each 4-bit value indicates:
+ * 0 => wide bar
+ * 1 => narrow bar
+ * 2 => wide space
+ */
+static const struct {
+ int code;
+ char ch;
+} code_39_encoding[] = {
+ {0x012110, '1'}, {0x102110, '2'}, {0x002111, '3'},
+ {0x112010, '4'}, {0x012011, '5'}, {0x102011, '6'},
+ {0x112100, '7'}, {0x012101, '8'}, {0x102101, '9'},
+ {0x112001, '0'}, {0x011210, 'A'}, {0x101210, 'B'},
+ {0x001211, 'C'}, {0x110210, 'D'}, {0x010211, 'E'},
+ {0x100211, 'F'}, {0x111200, 'G'}, {0x011201, 'H'},
+ {0x101201, 'I'}, {0x110201, 'J'}, {0x011120, 'K'},
+ {0x101120, 'L'}, {0x001121, 'M'}, {0x110120, 'N'},
+ {0x010121, 'O'}, {0x100121, 'P'}, {0x111020, 'Q'},
+ {0x011021, 'R'}, {0x101021, 'S'}, {0x110021, 'T'},
+ {0x021110, 'U'}, {0x120110, 'V'}, {0x020111, 'W'},
+ {0x121010, 'X'}, {0x021011, 'Y'}, {0x120011, 'Z'},
+ {0x121100, '-'}, {0x021101, '.'}, {0x120101, ' '},
+ {0x121001, '*'}, // 'stop' character
+};
+
+static int find_39_encoding(char ch)
+{
+ for (int i = 0; i < (int)ARRAY_SIZE(code_39_encoding); i++) {
+ if (code_39_encoding[i].ch == ch) {
+ return code_39_encoding[i].code;
+ }
+ }
+ return -1;
+}
+
+static int pdf_barcode_39_ch(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float char_width, float height,
+ uint32_t colour, char ch, float *new_x)
+{
+ float nw = char_width / 12.0f;
+ float ww = char_width / 4.0f;
+ int code = 0;
+
+ code = find_39_encoding(ch);
+ if (code < 0)
+ return pdf_set_err(pdf, -EINVAL, "Invalid Code 39 character %c 0x%x",
+ ch, ch);
+
+ for (int i = 5; i >= 0; i--) {
+ int pattern = (code >> i * 4) & 0xf;
+ if (pattern == 0) { // wide
+ if (pdf_add_filled_rectangle(pdf, page, x, y, ww - 1, height, 0,
+ colour, PDF_TRANSPARENT) < 0)
+ return pdf->errval;
+ x += ww;
+ }
+ if (pattern == 1) { // narrow
+ if (pdf_add_filled_rectangle(pdf, page, x, y, nw - 1, height, 0,
+ colour, PDF_TRANSPARENT) < 0)
+ return pdf->errval;
+ x += nw;
+ }
+ if (pattern == 2) { // space
+ x += nw;
+ }
+ }
+ if (new_x)
+ *new_x = x;
+ return 0;
+}
+
+static int pdf_add_barcode_39(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float width, float height,
+ const char *string, uint32_t colour)
+{
+ size_t len = strlen(string);
+ float char_width = width / (len + 2);
+ int e;
+
+ e = pdf_barcode_39_ch(pdf, page, x, y, char_width, height, colour, '*',
+ &x);
+ if (e < 0)
+ return e;
+
+ while (string && *string) {
+ e = pdf_barcode_39_ch(pdf, page, x, y, char_width, height, colour,
+ *string, &x);
+ if (e < 0)
+ return e;
+ string++;
+ }
+
+ e = pdf_barcode_39_ch(pdf, page, x, y, char_width, height, colour, '*',
+ NULL);
+ if (e < 0)
+ return e;
+
+ return 0;
+}
+
+/* EAN/UPC character encoding. Each 4-bit value indicates width in x units.
+ * Elements are SBSB (Space, Bar, Space, Bar) for LHS digits
+ * Elements are inverted for RHS digits
+ */
+static const int code_eanupc_encoding[] = {
+ 0x3211, // 0
+ 0x2221, // 1
+ 0x2122, // 2
+ 0x1411, // 3
+ 0x1132, // 4
+ 0x1231, // 5
+ 0x1114, // 6
+ 0x1312, // 7
+ 0x1213, // 8
+ 0x3112, // 9
+};
+
+/**
+ * List of different barcode guard patterns that are supported
+ */
+enum {
+ GUARD_NORMAL, //!< Produce normal guard pattern
+ GUARD_CENTRE, //!< Produce centre guard pattern
+ GUARD_SPECIAL, //!< Produce special guard pattern
+ GUARD_ADDON,
+ GUARD_ADDON_DELIN,
+};
+
+static const int code_eanupc_aux_encoding[] = {
+ 0x150, // Normal guard
+ 0x554, // Centre guard
+ 0x555, // Special guard
+ 0x160, // Add-on guard
+ 0x500, // Add-on delineator
+};
+
+static const int set_ean13_encoding[] = {
+ 0x00, // 0
+ 0x34, // 1
+ 0x2c, // 2
+ 0x1c, // 3
+ 0x32, // 4
+ 0x26, // 5
+ 0x0e, // 6
+ 0x2a, // 7
+ 0x1a, // 8
+ 0x16, // 9
+};
+
+static const int set_upce_encoding[] = {
+ 0x07, // 0
+ 0x0b, // 1
+ 0x13, // 2
+ 0x23, // 3
+ 0x0d, // 4
+ 0x19, // 5
+ 0x31, // 6
+ 0x15, // 7
+ 0x25, // 8
+ 0x29, // 9
+};
+
+#define EANUPC_X PDF_MM_TO_POINT(0.330f)
+
+static const struct {
+ unsigned modules;
+ float height_bar;
+ float height_outer;
+ unsigned quiet_left;
+ unsigned quiet_right;
+} eanupc_dimensions[] = {
+ {113, PDF_MM_TO_POINT(22.85), PDF_MM_TO_POINT(25.93), 11, 7}, // EAN-13
+ {113, PDF_MM_TO_POINT(22.85), PDF_MM_TO_POINT(25.93), 9, 9}, // UPC-A
+ {81, PDF_MM_TO_POINT(18.23), PDF_MM_TO_POINT(21.31), 7, 7}, // EAN-8
+ {67, PDF_MM_TO_POINT(22.85), PDF_MM_TO_POINT(25.93), 9, 7}, // UPC-E
+};
+
+static void pdf_barcode_eanupc_calc_dims(int type, float width, float height,
+ float *x_off, float *y_off,
+ float *new_width, float *new_height,
+ float *x, float *bar_height,
+ float *bar_ext, float *font_size)
+{
+ float aspectBarcode, aspectRect, scale;
+
+ aspectRect = width / height;
+ aspectBarcode = eanupc_dimensions[type - PDF_BARCODE_EAN13].modules *
+ EANUPC_X /
+ eanupc_dimensions[type - PDF_BARCODE_EAN13].height_outer;
+ if (aspectRect > aspectBarcode) {
+ *new_height = height;
+ *new_width = height * aspectBarcode;
+ } else if (aspectRect < aspectBarcode) {
+ *new_width = width;
+ *new_height = width / aspectBarcode;
+ } else {
+ *new_width = width;
+ *new_height = height;
+ }
+ scale = *new_height /
+ eanupc_dimensions[type - PDF_BARCODE_EAN13].height_outer;
+
+ *x = *new_width / eanupc_dimensions[type - PDF_BARCODE_EAN13].modules;
+ *bar_ext = *x * 5;
+ *bar_height =
+ eanupc_dimensions[type - PDF_BARCODE_EAN13].height_bar * scale;
+ *font_size = 8.0 * scale;
+ *x_off = (width - *new_width) / 2.0;
+ *y_off = (height - *new_height) / 2.0;
+}
+
+static int pdf_barcode_eanupc_ch(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float x_width,
+ float height, uint32_t colour, char ch,
+ int set, float *new_x)
+{
+ if ('0' > ch || ch > '9')
+ return pdf_set_err(pdf, -EINVAL, "Invalid EAN/UPC character %c 0x%x",
+ ch, ch);
+
+ int code;
+ code = code_eanupc_encoding[ch - '0'];
+
+ for (int i = 3; i >= 0; i--) {
+ int shift = (set == 1 ? 3 - i : i) * 4;
+ int bar = (set == 2 && i & 0x1) || (set != 2 && (i & 0x1) == 0);
+ float width = (code >> shift) & 0xf;
+
+ switch (ch) {
+ case '1':
+ case '2':
+ if ((set == 0 && bar) || (set != 0 && !bar)) {
+ width -= 1.0 / 13.0;
+ } else {
+ width += 1.0 / 13.0;
+ }
+ break;
+
+ case '7':
+ case '8':
+ if ((set == 0 && bar) || (set != 0 && !bar)) {
+ width += 1.0 / 13.0;
+ } else {
+ width -= 1.0 / 13.0;
+ }
+ break;
+ }
+
+ width *= x_width;
+ if (bar) {
+ if (pdf_add_filled_rectangle(pdf, page, x, y, width, height, 0,
+ colour, PDF_TRANSPARENT) < 0)
+ return pdf->errval;
+ }
+ x += width;
+ }
+ if (new_x)
+ *new_x = x;
+ return 0;
+}
+
+static int pdf_barcode_eanupc_aux(struct pdf_doc *pdf,
+ struct pdf_object *page, float x, float y,
+ float x_width, float height,
+ uint32_t colour, int guard_type,
+ float *new_x)
+{
+ int code = code_eanupc_aux_encoding[guard_type];
+
+ for (int i = 5; i >= 0; i--) {
+ int value = code >> i * 2 & 0x3;
+ if (value) {
+ if ((i & 0x1) == 0) {
+ if (pdf_add_filled_rectangle(pdf, page, x, y, x_width * value,
+ height, 0, colour,
+ PDF_TRANSPARENT) < 0)
+ return pdf->errval;
+ }
+ x += x_width * value;
+ }
+ }
+ if (new_x)
+ *new_x = x;
+ return 0;
+}
+
+static int pdf_add_barcode_ean13(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float width, float height,
+ const char *string, uint32_t colour)
+{
+ if (!string)
+ return 0;
+
+ size_t len = strlen(string);
+ int lead = 0;
+ if (len == 13) {
+ char ch = string[0];
+ if (!isdigit(*string))
+ return pdf_set_err(pdf, -EINVAL,
+ "Invalid EAN13 character %c 0x%x", ch, ch);
+ lead = ch - '0';
+ ++string;
+ } else if (len != 12)
+ return pdf_set_err(pdf, -EINVAL, "Invalid EAN13 string length %lu",
+ len);
+
+ /* Scale and calculate dimensions */
+ float x_off, y_off, new_width, new_height, x_width, bar_height, bar_ext,
+ font;
+
+ pdf_barcode_eanupc_calc_dims(PDF_BARCODE_EAN13, width, height, &x_off,
+ &y_off, &new_width, &new_height, &x_width,
+ &bar_height, &bar_ext, &font);
+
+ x += x_off;
+ y += y_off;
+ float bar_y = y + new_height - bar_height;
+
+ int e;
+ const char *save_font = pdf->current_font->font.name;
+ e = pdf_set_font(pdf, "Courier"); /* Built-in monospace font */
+ if (e < 0)
+ return e;
+
+ char text[2];
+ text[1] = 0;
+ text[0] = lead + '0';
+ e = pdf_add_text(pdf, page, text, font, x, y, colour);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ x += eanupc_dimensions[0].quiet_left * x_width;
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width,
+ bar_height + bar_ext, colour, GUARD_NORMAL,
+ &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ for (int i = 0; i != 6; i++) {
+ text[0] = *string;
+ e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour,
+ 7 * x_width, PDF_ALIGN_CENTER, NULL);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ int set = (set_ean13_encoding[lead] & 1 << i) ? 1 : 0;
+ e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y, x_width, bar_height,
+ colour, *string, set, &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ string++;
+ }
+
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width,
+ bar_height + bar_ext, colour, GUARD_CENTRE,
+ &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ for (int i = 0; i != 6; i++) {
+ text[0] = *string;
+ e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour,
+ 7 * x_width, PDF_ALIGN_CENTER, NULL);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y, x_width, bar_height,
+ colour, *string, 2, &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ string++;
+ }
+
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width,
+ bar_height + bar_ext, colour, GUARD_NORMAL,
+ &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ text[0] = '>';
+ x += eanupc_dimensions[0].quiet_right * x_width -
+ 604.0f * font / (14.0f * 72.0f);
+ e = pdf_add_text(pdf, page, text, font, x, y, colour);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ pdf_set_font(pdf, save_font);
+ return 0;
+}
+
+static int pdf_add_barcode_upca(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float width, float height,
+ const char *string, uint32_t colour)
+{
+ if (!string)
+ return 0;
+
+ size_t len = strlen(string);
+ if (len != 12)
+ return pdf_set_err(pdf, -EINVAL, "Invalid UPCA string length %lu",
+ len);
+
+ /* Scale and calculate dimensions */
+ float x_off, y_off, new_width, new_height;
+ float x_width, bar_height, bar_ext, font;
+
+ pdf_barcode_eanupc_calc_dims(PDF_BARCODE_UPCA, width, height, &x_off,
+ &y_off, &new_width, &new_height, &x_width,
+ &bar_height, &bar_ext, &font);
+
+ x += x_off;
+ y += y_off;
+ float bar_y = y + new_height - bar_height;
+
+ int e;
+ const char *save_font = pdf->current_font->font.name;
+ e = pdf_set_font(pdf, "Courier");
+ if (e < 0)
+ return e;
+
+ char text[2];
+ text[1] = 0;
+ text[0] = *string;
+ e = pdf_add_text(pdf, page, text, font * 4.0 / 7.0, x, y, colour);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ x += eanupc_dimensions[1].quiet_left * x_width;
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width,
+ bar_height + bar_ext, colour, GUARD_NORMAL,
+ &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ for (int i = 0; i != 6; i++) {
+ text[0] = *string;
+ if (i) {
+ e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour,
+ 7 * x_width, PDF_ALIGN_CENTER, NULL);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ }
+
+ e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y - (i ? 0 : bar_ext),
+ x_width, bar_height + (i ? 0 : bar_ext),
+ colour, *string, 0, &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ string++;
+ }
+
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width,
+ bar_height + bar_ext, colour, GUARD_CENTRE,
+ &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ for (int i = 0; i != 6; i++) {
+ text[0] = *string;
+ if (i != 5) {
+ e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour,
+ 7 * x_width, PDF_ALIGN_CENTER, NULL);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ }
+
+ e = pdf_barcode_eanupc_ch(
+ pdf, page, x, bar_y - (i != 5 ? 0 : bar_ext), x_width,
+ bar_height + (i != 5 ? 0 : bar_ext), colour, *string, 2, &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ string++;
+ }
+
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width,
+ bar_height + bar_ext, colour, GUARD_NORMAL,
+ &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ text[0] = *--string;
+
+ x += eanupc_dimensions[1].quiet_right * x_width -
+ 604.0f * font * 4.0f / 7.0f / (14.0f * 72.0f);
+ e = pdf_add_text(pdf, page, text, font * 4.0 / 7.0, x, y, colour);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ pdf_set_font(pdf, save_font);
+ return 0;
+}
+
+static int pdf_add_barcode_ean8(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float width, float height,
+ const char *string, uint32_t colour)
+{
+ if (!string)
+ return 0;
+
+ size_t len = strlen(string);
+ if (len != 8)
+ return pdf_set_err(pdf, -EINVAL, "Invalid EAN8 string length %lu",
+ len);
+
+ /* Scale and calculate dimensions */
+ float x_off, y_off, new_width, new_height, x_width, bar_height, bar_ext,
+ font;
+
+ pdf_barcode_eanupc_calc_dims(PDF_BARCODE_EAN8, width, height, &x_off,
+ &y_off, &new_width, &new_height, &x_width,
+ &bar_height, &bar_ext, &font);
+
+ x += x_off;
+ y += y_off;
+ float bar_y = y + new_height - bar_height;
+
+ int e;
+ const char *save_font = pdf->current_font->font.name;
+ e = pdf_set_font(pdf, "Courier"); /* Built-in monospace font */
+ if (e < 0)
+ return e;
+
+ char text[2];
+ text[1] = 0;
+ text[0] = '<';
+ e = pdf_add_text(pdf, page, text, font, x, y, colour);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ x += eanupc_dimensions[2].quiet_left * x_width;
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width,
+ bar_height + bar_ext, colour, GUARD_NORMAL,
+ &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ for (int i = 0; i != 4; i++) {
+ text[0] = *string;
+ e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour,
+ 7 * x_width, PDF_ALIGN_CENTER, NULL);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y, x_width, bar_height,
+ colour, *string, 0, &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ string++;
+ }
+
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width,
+ bar_height + bar_ext, colour, GUARD_CENTRE,
+ &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ for (int i = 0; i != 4; i++) {
+ text[0] = *string;
+ e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour,
+ 7 * x_width, PDF_ALIGN_CENTER, NULL);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y, x_width, bar_height,
+ colour, *string, 2, &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ string++;
+ }
+
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width,
+ bar_height + bar_ext, colour, GUARD_NORMAL,
+ &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ text[0] = '>';
+ x += eanupc_dimensions[0].quiet_right * x_width -
+ 604.0f * font / (14.0f * 72.0f);
+ e = pdf_add_text(pdf, page, text, font, x, y, colour);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ pdf_set_font(pdf, save_font);
+ return 0;
+}
+
+static int pdf_add_barcode_upce(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float width, float height,
+ const char *string, uint32_t colour)
+{
+ if (!string)
+ return 0;
+
+ size_t len = strlen(string);
+ if (len != 12)
+ return pdf_set_err(pdf, -EINVAL, "Invalid UPCE string length %lu",
+ len);
+
+ if (*string != '0')
+ return pdf_set_err(pdf, -EINVAL, "Invalid UPCE char %c at start",
+ *string);
+
+ for (size_t i = 0; i < len; i++) {
+ if (!isdigit(string[i]))
+ return pdf_set_err(pdf, -EINVAL, "Invalid UPCE char 0x%x at %zd",
+ string[i], i);
+ }
+
+ /* Scale and calculate dimensions */
+ float x_off, y_off, new_width, new_height;
+ float x_width, bar_height, bar_ext, font;
+
+ pdf_barcode_eanupc_calc_dims(PDF_BARCODE_UPCE, width, height, &x_off,
+ &y_off, &new_width, &new_height, &x_width,
+ &bar_height, &bar_ext, &font);
+
+ x += x_off;
+ y += y_off;
+ float bar_y = y + new_height - bar_height;
+
+ int e;
+ const char *save_font = pdf->current_font->font.name;
+ e = pdf_set_font(pdf, "Courier");
+ if (e < 0)
+ return e;
+
+ char text[2];
+ text[1] = 0;
+ text[0] = string[0];
+ e = pdf_add_text(pdf, page, text, font * 4.0 / 7.0, x, y, colour);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ x += eanupc_dimensions[2].quiet_left * x_width;
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y, x_width, bar_height,
+ colour, GUARD_NORMAL, &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ char X[6];
+ if (string[5] && memcmp(string + 6, "0000", 4) == 0 &&
+ '5' <= string[10] && string[10] <= '9') {
+ memcpy(X, string + 1, 5);
+ X[5] = string[10];
+ } else if (string[4] && memcmp(string + 5, "00000", 5) == 0) {
+ memcpy(X, string + 1, 4);
+ X[4] = string[11];
+ X[5] = 4;
+ } else if ('0' <= string[3] && string[3] <= '2' &&
+ memcmp(string + 4, "0000", 4) == 0) {
+ X[0] = string[1];
+ X[1] = string[2];
+ X[2] = string[8];
+ X[3] = string[9];
+ X[4] = string[10];
+ X[5] = string[3];
+ } else if ('3' <= string[3] && string[3] <= '9' &&
+ memcmp(string + 4, "00000", 5) == 0) {
+ memcpy(X, string + 1, 3);
+ X[3] = string[9];
+ X[4] = string[10];
+ X[5] = 3;
+ } else {
+ pdf_set_font(pdf, save_font);
+ return pdf_set_err(pdf, -EINVAL, "Invalid UPCE string format");
+ }
+
+ for (int i = 0; i != 6; i++) {
+ text[0] = X[i];
+ e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour,
+ 7 * x_width, PDF_ALIGN_CENTER, NULL);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ int set = (set_upce_encoding[string[11] - '0'] & 1 << i) ? 1 : 0;
+ e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y, x_width, bar_height,
+ colour, X[i], set, &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+ }
+
+ e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y, x_width, bar_height,
+ colour, GUARD_SPECIAL, &x);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ text[0] = string[11];
+ x += eanupc_dimensions[0].quiet_right * x_width -
+ 604.0f * font * 4.0f / 7.0f / (14.0f * 72.0f);
+ e = pdf_add_text(pdf, page, text, font * 4.0 / 7.0, x, y, colour);
+ if (e < 0) {
+ pdf_set_font(pdf, save_font);
+ return e;
+ }
+
+ pdf_set_font(pdf, save_font);
+ return 0;
+}
+
+int pdf_add_barcode(struct pdf_doc *pdf, struct pdf_object *page, int code,
+ float x, float y, float width, float height,
+ const char *string, uint32_t colour)
+{
+ if (!string || !*string)
+ return 0;
+ switch (code) {
+ case PDF_BARCODE_128A:
+ return pdf_add_barcode_128a(pdf, page, x, y, width, height, string,
+ colour);
+ case PDF_BARCODE_39:
+ return pdf_add_barcode_39(pdf, page, x, y, width, height, string,
+ colour);
+ case PDF_BARCODE_EAN13:
+ return pdf_add_barcode_ean13(pdf, page, x, y, width, height, string,
+ colour);
+ case PDF_BARCODE_UPCA:
+ return pdf_add_barcode_upca(pdf, page, x, y, width, height, string,
+ colour);
+ case PDF_BARCODE_EAN8:
+ return pdf_add_barcode_ean8(pdf, page, x, y, width, height, string,
+ colour);
+ case PDF_BARCODE_UPCE:
+ return pdf_add_barcode_upce(pdf, page, x, y, width, height, string,
+ colour);
+ default:
+ return pdf_set_err(pdf, -EINVAL, "Invalid barcode code %d", code);
+ }
+}
+
+static pdf_object *pdf_add_raw_grayscale8(struct pdf_doc *pdf,
+ const uint8_t *data, uint32_t width,
+ uint32_t height)
+{
+ struct pdf_object *obj;
+ size_t len;
+ const char *endstream = ">\r\nendstream\r\n";
+ struct dstr str = INIT_DSTR;
+ size_t data_len = (size_t)width * (size_t)height;
+
+ dstr_printf(&str,
+ "<<\r\n"
+ " /Type /XObject\r\n"
+ " /Name /Image%d\r\n"
+ " /Subtype /Image\r\n"
+ " /ColorSpace /DeviceGray\r\n"
+ " /Height %d\r\n"
+ " /Width %d\r\n"
+ " /BitsPerComponent 8\r\n"
+ " /Length %zu\r\n"
+ ">>stream\r\n",
+ flexarray_size(&pdf->objects), height, width, data_len + 1);
+
+ len = dstr_len(&str) + data_len + strlen(endstream) + 1;
+ if (dstr_ensure(&str, len) < 0) {
+ dstr_free(&str);
+ pdf_set_err(pdf, -ENOMEM,
+ "Unable to allocate %zu bytes memory for image", len);
+ return NULL;
+ }
+ dstr_append_data(&str, data, data_len);
+ dstr_append(&str, endstream);
+
+ obj = pdf_add_object(pdf, OBJ_image);
+ if (!obj) {
+ dstr_free(&str);
+ return NULL;
+ }
+ obj->stream = str;
+
+ return obj;
+}
+
+static struct pdf_object *pdf_add_raw_rgb24(struct pdf_doc *pdf,
+ const uint8_t *data,
+ uint32_t width, uint32_t height)
+{
+ struct pdf_object *obj;
+ size_t len;
+ const char *endstream = ">\r\nendstream\r\n";
+ struct dstr str = INIT_DSTR;
+ size_t data_len = (size_t)width * (size_t)height * 3;
+
+ dstr_printf(&str,
+ "<<\r\n"
+ " /Type /XObject\r\n"
+ " /Name /Image%d\r\n"
+ " /Subtype /Image\r\n"
+ " /ColorSpace /DeviceRGB\r\n"
+ " /Height %d\r\n"
+ " /Width %d\r\n"
+ " /BitsPerComponent 8\r\n"
+ " /Length %zu\r\n"
+ ">>stream\r\n",
+ flexarray_size(&pdf->objects), height, width, data_len + 1);
+
+ len = dstr_len(&str) + data_len + strlen(endstream) + 1;
+ if (dstr_ensure(&str, len) < 0) {
+ dstr_free(&str);
+ pdf_set_err(pdf, -ENOMEM,
+ "Unable to allocate %zu bytes memory for image", len);
+ return NULL;
+ }
+ dstr_append_data(&str, data, data_len);
+ dstr_append(&str, endstream);
+
+ obj = pdf_add_object(pdf, OBJ_image);
+ if (!obj) {
+ dstr_free(&str);
+ return NULL;
+ }
+ obj->stream = str;
+
+ return obj;
+}
+
+static uint8_t *get_file(struct pdf_doc *pdf, const char *file_name,
+ size_t *length)
+{
+ FILE *fp;
+ uint8_t *file_data;
+ struct stat buf;
+ off_t len;
+
+ if ((fp = fopen(file_name, "rb")) == NULL) {
+ pdf_set_err(pdf, -errno, "Unable to open %s: %s", file_name,
+ strerror(errno));
+ return NULL;
+ }
+
+ if (fstat(fileno(fp), &buf) < 0) {
+ pdf_set_err(pdf, -errno, "Unable to access %s: %s", file_name,
+ strerror(errno));
+ fclose(fp);
+ return NULL;
+ }
+
+ len = buf.st_size;
+
+ file_data = (uint8_t *)malloc(len);
+ if (!file_data) {
+ pdf_set_err(pdf, -ENOMEM, "Unable to allocate: %d", (int)len);
+ fclose(fp);
+ return NULL;
+ }
+
+ if (fread(file_data, len, 1, fp) != 1) {
+ pdf_set_err(pdf, -errno, "Unable to read full data: %s", file_name);
+ free(file_data);
+ fclose(fp);
+ return NULL;
+ }
+
+ fclose(fp);
+
+ *length = len;
+
+ return file_data;
+}
+
+static struct pdf_object *
+pdf_add_raw_jpeg_data(struct pdf_doc *pdf, const struct pdf_img_info *info,
+ const uint8_t *jpeg_data, size_t len)
+{
+ struct pdf_object *obj = pdf_add_object(pdf, OBJ_image);
+ if (!obj)
+ return NULL;
+
+ dstr_printf(&obj->stream,
+ "<<\r\n"
+ " /Type /XObject\r\n"
+ " /Name /Image%d\r\n"
+ " /Subtype /Image\r\n"
+ " /ColorSpace %s\r\n"
+ " /Width %d\r\n"
+ " /Height %d\r\n"
+ " /BitsPerComponent 8\r\n"
+ " /Filter /DCTDecode\r\n"
+ " /Length %zu\r\n"
+ ">>stream\r\n",
+ flexarray_size(&pdf->objects),
+ (info->jpeg.ncolours == 1) ? "/DeviceGray" : "/DeviceRGB",
+ info->width, info->height, len);
+ dstr_append_data(&obj->stream, jpeg_data, len);
+
+ dstr_printf(&obj->stream, "\r\nendstream\r\n");
+
+ return obj;
+}
+
+/**
+ * Get the display dimensions of an image, respecting the images aspect ratio
+ * if only one desired display dimension is defined.
+ * The pdf parameter is only used for setting the error value.
+ */
+static int get_img_display_dimensions(struct pdf_doc *pdf, uint32_t img_width,
+ uint32_t img_height,
+ float *display_width,
+ float *display_height)
+{
+ if (!display_height || !display_width) {
+ return pdf_set_err(
+ pdf, -EINVAL,
+ "display_width and display_height may not be null pointers");
+ }
+
+ const float display_width_in = *display_width;
+ const float display_height_in = *display_height;
+
+ if (display_width_in < 0 && display_height_in < 0) {
+ return pdf_set_err(pdf, -EINVAL,
+ "Unable to determine image display dimensions, "
+ "display_width and display_height are both < 0");
+ }
+ if (img_width == 0 || img_height == 0) {
+ return pdf_set_err(pdf, -EINVAL,
+ "Invalid image dimensions received, the loaded "
+ "image appears to be empty.");
+ }
+
+ if (display_width_in < 0) {
+ // Set width, keeping aspect ratio
+ *display_width = display_height_in * ((float)img_width / img_height);
+ } else if (display_height_in < 0) {
+ // Set height, keeping aspect ratio
+ *display_height = display_width_in * ((float)img_height / img_width);
+ }
+ return 0;
+}
+
+static int pdf_add_image(struct pdf_doc *pdf, struct pdf_object *page,
+ struct pdf_object *image, float x, float y,
+ float width, float height)
+{
+ int ret;
+ struct dstr str = INIT_DSTR;
+
+ dstr_append(&str, "q ");
+ dstr_printf(&str, "%f 0 0 %f %f %f cm ", width, height, x, y);
+ dstr_printf(&str, "/Image%d Do ", image->index);
+ dstr_append(&str, "Q");
+
+ ret = pdf_add_stream(pdf, page, dstr_data(&str));
+ dstr_free(&str);
+ return ret;
+}
+
+// Works like fgets, except it's for a fixed in-memory buffer of data
+static size_t dgets(const uint8_t *data, size_t *pos, size_t len, char *line,
+ size_t line_len)
+{
+ size_t line_pos = 0;
+
+ if (*pos >= len)
+ return 0;
+
+ while ((*pos) < len) {
+ if (line_pos < line_len) {
+ // Reject non-ascii data
+ if (data[*pos] & 0x80) {
+ return 0;
+ }
+ line[line_pos] = data[*pos];
+ line_pos++;
+ }
+ if (data[*pos] == '\n') {
+ (*pos)++;
+ break;
+ }
+ (*pos)++;
+ }
+
+ if (line_pos < line_len) {
+ line[line_pos] = '\0';
+ }
+
+ return *pos;
+}
+
+static int parse_ppm_header(struct pdf_img_info *info, const uint8_t *data,
+ size_t length, char *err_msg,
+ size_t err_msg_length)
+{
+ char line[1024];
+ memset(line, '\0', sizeof(line));
+ size_t pos = 0;
+
+ // Load the PPM file
+ if (!dgets(data, &pos, length, line, sizeof(line) - 1)) {
+ snprintf(err_msg, err_msg_length, "Invalid PPM file");
+ return -EINVAL;
+ }
+
+ // Determine number of color channels (Also, we only support binary ppms)
+ int ncolors;
+ if (strncmp(line, "P6", 2) == 0) {
+ info->ppm.color_space = PPM_BINARY_COLOR_RGB;
+ ncolors = 3;
+ } else if (strncmp(line, "P5", 2) == 0) {
+ info->ppm.color_space = PPM_BINARY_COLOR_GRAY;
+ ncolors = 1;
+ } else {
+ snprintf(err_msg, err_msg_length,
+ "Only binary PPM files (grayscale, RGB) supported");
+ return -EINVAL;
+ }
+
+ // Skip comments before header
+ do {
+ if (!dgets(data, &pos, length, line, sizeof(line) - 1)) {
+ snprintf(err_msg, err_msg_length, "Unable to find PPM header");
+ return -EINVAL;
+ }
+ } while (line[0] == '#');
+
+ // Read image dimensions
+ if (sscanf(line, "%u %u\n", &(info->width), &(info->height)) != 2) {
+ snprintf(err_msg, err_msg_length, "Unable to find PPM size");
+ return -EINVAL;
+ }
+ if (info->width > MAX_IMAGE_WIDTH || info->height > MAX_IMAGE_HEIGHT) {
+ snprintf(err_msg, err_msg_length, "Invalid width/height: %ux%u",
+ info->width, info->height);
+ return -EINVAL;
+ }
+ info->ppm.size = (size_t)(info->width * info->height * ncolors);
+ info->ppm.data_begin_pos = pos;
+
+ return 0;
+}
+
+static int pdf_add_ppm_data(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float display_width,
+ float display_height,
+ const struct pdf_img_info *info,
+ const uint8_t *ppm_data, size_t len)
+{
+ char line[1024];
+ // We start reading at the position delivered by parse_ppm_header,
+ // since we already parsed the header of the file there.
+ size_t pos = info->ppm.data_begin_pos;
+
+ /* Skip over the byte-size line */
+ if (!dgets(ppm_data, &pos, len, line, sizeof(line) - 1))
+ return pdf_set_err(pdf, -EINVAL, "No byte-size line in PPM file");
+
+ /* Try and limit the memory usage to sane images */
+ if (info->width > MAX_IMAGE_WIDTH || info->height > MAX_IMAGE_HEIGHT) {
+ return pdf_set_err(pdf, -EINVAL,
+ "Invalid width/height in PPM file: %ux%u",
+ info->width, info->height);
+ }
+
+ if (info->ppm.size > len - pos) {
+ return pdf_set_err(pdf, -EINVAL, "Insufficient image data available");
+ }
+
+ switch (info->ppm.color_space) {
+ case PPM_BINARY_COLOR_GRAY:
+ return pdf_add_grayscale8(pdf, page, x, y, display_width,
+ display_height, &ppm_data[pos], info->width,
+ info->height);
+ break;
+
+ case PPM_BINARY_COLOR_RGB:
+ return pdf_add_rgb24(pdf, page, x, y, display_width, display_height,
+ &ppm_data[pos], info->width, info->height);
+ break;
+
+ default:
+ return pdf_set_err(pdf, -EINVAL,
+ "Invalid color space in ppm file: %i",
+ info->ppm.color_space);
+ break;
+ }
+}
+
+static int parse_jpeg_header(struct pdf_img_info *info, const uint8_t *data,
+ size_t length, char *err_msg,
+ size_t err_msg_length)
+{
+ // See http://www.videotechnology.com/jpeg/j1.html for details
+ if (length >= 4 && data[0] == 0xFF && data[1] == 0xD8) {
+ for (size_t i = 2; i < length; i++) {
+ if (data[i] != 0xff) {
+ break;
+ }
+ while (++i < length && data[i] == 0xff)
+ ;
+ if (i + 2 >= length) {
+ break;
+ }
+ int len = data[i + 1] * 256 + data[i + 2];
+ /* Search for SOFn marker and decode jpeg details */
+ if ((data[i] & 0xf4) == 0xc0) {
+ if (len >= 9 && i + len + 1 < length) {
+ info->height = data[i + 4] * 256 + data[i + 5];
+ info->width = data[i + 6] * 256 + data[i + 7];
+ info->jpeg.ncolours = data[i + 8];
+ return 0;
+ }
+ break;
+ }
+ i += len;
+ }
+ }
+ snprintf(err_msg, err_msg_length, "Error parsing JPEG header");
+ return -EINVAL;
+}
+
+static int pdf_add_jpeg_data(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float display_width,
+ float display_height, struct pdf_img_info *info,
+ const uint8_t *jpeg_data, size_t len)
+{
+ struct pdf_object *obj;
+
+ obj = pdf_add_raw_jpeg_data(pdf, info, jpeg_data, len);
+ if (!obj)
+ return pdf->errval;
+
+ if (get_img_display_dimensions(pdf, info->width, info->height,
+ &display_width, &display_height)) {
+ return pdf->errval;
+ }
+ return pdf_add_image(pdf, page, obj, x, y, display_width, display_height);
+}
+
+int pdf_add_rgb24(struct pdf_doc *pdf, struct pdf_object *page, float x,
+ float y, float display_width, float display_height,
+ const uint8_t *data, uint32_t width, uint32_t height)
+{
+ struct pdf_object *obj;
+
+ obj = pdf_add_raw_rgb24(pdf, data, width, height);
+ if (!obj)
+ return pdf->errval;
+
+ if (get_img_display_dimensions(pdf, width, height, &display_width,
+ &display_height)) {
+ return pdf->errval;
+ }
+ return pdf_add_image(pdf, page, obj, x, y, display_width, display_height);
+}
+
+int pdf_add_grayscale8(struct pdf_doc *pdf, struct pdf_object *page, float x,
+ float y, float display_width, float display_height,
+ const uint8_t *data, uint32_t width, uint32_t height)
+{
+ struct pdf_object *obj;
+
+ obj = pdf_add_raw_grayscale8(pdf, data, width, height);
+ if (!obj)
+ return pdf->errval;
+
+ if (get_img_display_dimensions(pdf, width, height, &display_width,
+ &display_height)) {
+ return pdf->errval;
+ }
+ return pdf_add_image(pdf, page, obj, x, y, display_width, display_height);
+}
+
+static int parse_png_header(struct pdf_img_info *info, const uint8_t *data,
+ size_t length, char *err_msg,
+ size_t err_msg_length)
+{
+ if (length <= sizeof(png_signature)) {
+ snprintf(err_msg, err_msg_length, "PNG file too short");
+ return -EINVAL;
+ }
+
+ if (memcmp(data, png_signature, sizeof(png_signature))) {
+ snprintf(err_msg, err_msg_length, "File is not correct PNG file");
+ return -EINVAL;
+ }
+
+ // process first PNG chunk
+ uint32_t pos = sizeof(png_signature);
+ const struct png_chunk *chunk = (const struct png_chunk *)&data[pos];
+ pos += sizeof(struct png_chunk);
+ if (pos > length) {
+ snprintf(err_msg, err_msg_length, "PNG file too short");
+ return -EINVAL;
+ }
+ if (strncmp(chunk->type, png_chunk_header, 4) == 0) {
+ // header found, process width and height, check errors
+ struct png_header *header = &info->png;
+
+ if (pos + sizeof(struct png_header) > length) {
+ snprintf(err_msg, err_msg_length, "PNG file too short");
+ return -EINVAL;
+ }
+
+ memcpy(header, &data[pos], sizeof(struct png_header));
+ if (header->deflate != 0) {
+ snprintf(err_msg, err_msg_length, "Deflate wrong in PNG header");
+ return -EINVAL;
+ }
+ if (header->bitDepth == 0) {
+ snprintf(err_msg, err_msg_length, "PNG file has zero bit depth");
+ return -EINVAL;
+ }
+ // ensure the width and height values have the proper byte order
+ // and copy them into the info struct.
+ header->width = ntoh32(header->width);
+ header->height = ntoh32(header->height);
+ info->width = header->width;
+ info->height = header->height;
+ return 0;
+ }
+ snprintf(err_msg, err_msg_length, "Failed to read PNG file header");
+ return -EINVAL;
+}
+
+static int pdf_add_png_data(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float display_width,
+ float display_height,
+ const struct pdf_img_info *img_info,
+ const uint8_t *png_data, size_t png_data_length)
+{
+ // indicates if we return an error or add the img at the
+ // end of the function
+ bool success = false;
+
+ // string stream used for writing color space (and palette) info
+ // into the pdf
+ struct dstr colour_space = INIT_DSTR;
+
+ struct pdf_object *obj = NULL;
+ uint8_t *final_data = NULL;
+ int written = 0;
+ uint32_t pos;
+ uint8_t *png_data_temp = NULL;
+ size_t png_data_total_length = 0;
+ uint8_t ncolours;
+
+ // Stores palette information for indexed PNGs
+ struct rgb_value *palette_buffer = NULL;
+ size_t palette_buffer_length = 0;
+
+ const struct png_header *header = &img_info->png;
+
+ // Father info from png header
+ switch (header->colorType) {
+ case PNG_COLOR_GREYSCALE:
+ ncolours = 1;
+ break;
+ case PNG_COLOR_RGB:
+ ncolours = 3;
+ break;
+ case PNG_COLOR_INDEXED:
+ ncolours = 1;
+ break;
+ // PNG_COLOR_RGBA and PNG_COLOR_GREYSCALE_A are unsupported
+ default:
+ pdf_set_err(pdf, -EINVAL, "PNG has unsupported color type: %d",
+ header->colorType);
+ goto free_buffers;
+ break;
+ }
+
+ /* process PNG chunks */
+ pos = sizeof(png_signature);
+
+ while (1) {
+ const struct png_chunk *chunk;
+
+ chunk = (const struct png_chunk *)&png_data[pos];
+ pos += sizeof(struct png_chunk);
+
+ if (pos > png_data_length - 4) {
+ pdf_set_err(pdf, -EINVAL, "PNG file too short");
+ goto free_buffers;
+ }
+ const uint32_t chunk_length = ntoh32(chunk->length);
+ // chunk length + 4-bytes of CRC
+ if (chunk_length > png_data_length - pos - 4) {
+ pdf_set_err(pdf, -EINVAL, "PNG chunk exceeds file: %d vs %ld",
+ chunk_length, png_data_length - pos - 4);
+ goto free_buffers;
+ }
+ if (strncmp(chunk->type, png_chunk_header, 4) == 0) {
+ // Ignoring the header, since it was parsed
+ // before calling this function.
+ } else if (strncmp(chunk->type, png_chunk_palette, 4) == 0) {
+ // Palette chunk
+ if (header->colorType == PNG_COLOR_INDEXED) {
+ // palette chunk is needed for indexed images
+ if (palette_buffer) {
+ pdf_set_err(pdf, -EINVAL,
+ "PNG contains multiple palette chunks");
+ goto free_buffers;
+ }
+ if (chunk_length % 3 != 0) {
+ pdf_set_err(pdf, -EINVAL,
+ "PNG format error: palette chunk length is "
+ "not divisbly by 3!");
+ goto free_buffers;
+ }
+ palette_buffer_length = (size_t)(chunk_length / 3);
+ if (palette_buffer_length > 256 ||
+ palette_buffer_length == 0) {
+ pdf_set_err(pdf, -EINVAL,
+ "PNG palette length invalid: %zd",
+ palette_buffer_length);
+ goto free_buffers;
+ }
+ palette_buffer = (struct rgb_value *)malloc(
+ palette_buffer_length * sizeof(struct rgb_value));
+ if (!palette_buffer) {
+ pdf_set_err(pdf, -ENOMEM,
+ "Could not allocate memory for indexed color "
+ "palette (%zu bytes)",
+ palette_buffer_length *
+ sizeof(struct rgb_value));
+ goto free_buffers;
+ }
+ for (size_t i = 0; i < palette_buffer_length; i++) {
+ size_t offset = (i * 3) + pos;
+ palette_buffer[i].red = png_data[offset];
+ palette_buffer[i].green = png_data[offset + 1];
+ palette_buffer[i].blue = png_data[offset + 2];
+ }
+ } else if (header->colorType == PNG_COLOR_RGB ||
+ header->colorType == PNG_COLOR_RGBA) {
+ // palette chunk is optional for RGB(A) images
+ // but we do not process them
+ } else {
+ pdf_set_err(pdf, -EINVAL,
+ "Unexpected palette chunk for color type %d",
+ header->colorType);
+ goto free_buffers;
+ }
+ } else if (strncmp(chunk->type, png_chunk_data, 4) == 0) {
+ if (chunk_length > 0 && chunk_length < png_data_length - pos) {
+ uint8_t *data = (uint8_t *)realloc(
+ png_data_temp, png_data_total_length + chunk_length);
+ // (uint8_t *)realloc(info.data, info.length + chunk_length);
+ if (!data) {
+ pdf_set_err(pdf, -ENOMEM, "No memory for PNG data");
+ goto free_buffers;
+ }
+ png_data_temp = data;
+ memcpy(&png_data_temp[png_data_total_length], &png_data[pos],
+ chunk_length);
+ png_data_total_length += chunk_length;
+ }
+ } else if (strncmp(chunk->type, png_chunk_end, 4) == 0) {
+ /* end of file, exit */
+ break;
+ }
+
+ if (chunk_length >= png_data_length) {
+ pdf_set_err(pdf, -EINVAL, "PNG chunk length larger than file");
+ goto free_buffers;
+ }
+
+ pos += chunk_length; // add chunk length
+ pos += sizeof(uint32_t); // add CRC length
+ }
+
+ /* if no length was found */
+ if (png_data_total_length == 0) {
+ pdf_set_err(pdf, -EINVAL, "PNG file has zero length");
+ goto free_buffers;
+ }
+
+ switch (header->colorType) {
+ case PNG_COLOR_GREYSCALE:
+ dstr_append(&colour_space, "/DeviceGray");
+ break;
+ case PNG_COLOR_RGB:
+ dstr_append(&colour_space, "/DeviceRGB");
+ break;
+ case PNG_COLOR_INDEXED:
+ if (palette_buffer_length == 0) {
+ pdf_set_err(pdf, -EINVAL, "Indexed PNG contains no palette");
+ goto free_buffers;
+ }
+ // Write the color palette to the color_palette buffer
+ dstr_printf(&colour_space,
+ "[ /Indexed\r\n"
+ " /DeviceRGB\r\n"
+ " %zu\r\n"
+ " <",
+ palette_buffer_length - 1);
+ // write individual paletter values
+ // the index value for every RGB value is determined by its position
+ // (0, 1, 2, ...)
+ for (size_t i = 0; i < palette_buffer_length; i++) {
+ dstr_printf(&colour_space, "%02X%02X%02X ", palette_buffer[i].red,
+ palette_buffer[i].green, palette_buffer[i].blue);
+ }
+ dstr_append(&colour_space, ">\r\n]");
+ break;
+
+ default:
+ pdf_set_err(pdf, -EINVAL,
+ "Cannot map PNG color type %d to PDF color space",
+ header->colorType);
+ goto free_buffers;
+ break;
+ }
+
+ final_data = (uint8_t *)malloc(png_data_total_length + 1024 +
+ dstr_len(&colour_space));
+ if (!final_data) {
+ pdf_set_err(pdf, -ENOMEM, "Unable to allocate PNG data %zu",
+ png_data_total_length + 1024 + dstr_len(&colour_space));
+ goto free_buffers;
+ }
+
+ // Write image information to PDF
+ written =
+ sprintf((char *)final_data,
+ "<<\r\n"
+ " /Type /XObject\r\n"
+ " /Name /Image%d\r\n"
+ " /Subtype /Image\r\n"
+ " /ColorSpace %s\r\n"
+ " /Width %u\r\n"
+ " /Height %u\r\n"
+ " /Interpolate true\r\n"
+ " /BitsPerComponent %u\r\n"
+ " /Filter /FlateDecode\r\n"
+ " /DecodeParms << /Predictor 15 /Colors %d "
+ "/BitsPerComponent %u /Columns %u >>\r\n"
+ " /Length %zu\r\n"
+ ">>stream\r\n",
+ flexarray_size(&pdf->objects), dstr_data(&colour_space),
+ header->width, header->height, header->bitDepth, ncolours,
+ header->bitDepth, header->width, png_data_total_length);
+
+ memcpy(&final_data[written], png_data_temp, png_data_total_length);
+ written += png_data_total_length;
+ written += sprintf((char *)&final_data[written], "\r\nendstream\r\n");
+
+ obj = pdf_add_object(pdf, OBJ_image);
+ if (!obj) {
+ goto free_buffers;
+ }
+
+ dstr_append_data(&obj->stream, final_data, written);
+
+ if (get_img_display_dimensions(pdf, header->width, header->height,
+ &display_width, &display_height)) {
+ goto free_buffers;
+ }
+ success = true;
+
+free_buffers:
+ if (final_data)
+ free(final_data);
+ if (palette_buffer)
+ free(palette_buffer);
+ if (png_data_temp)
+ free(png_data_temp);
+ dstr_free(&colour_space);
+
+ if (success)
+ return pdf_add_image(pdf, page, obj, x, y, display_width,
+ display_height);
+ else
+ return pdf->errval;
+}
+
+static int parse_bmp_header(struct pdf_img_info *info, const uint8_t *data,
+ size_t data_length, char *err_msg,
+ size_t err_msg_length)
+{
+ if (data_length < sizeof(bmp_signature) + sizeof(struct bmp_header)) {
+ snprintf(err_msg, err_msg_length, "File is too short");
+ return -EINVAL;
+ }
+
+ if (memcmp(data, bmp_signature, sizeof(bmp_signature))) {
+ snprintf(err_msg, err_msg_length, "File is not correct BMP file");
+ return -EINVAL;
+ }
+ memcpy(&info->bmp, &data[sizeof(bmp_signature)],
+ sizeof(struct bmp_header));
+ if (info->bmp.biWidth < 0) {
+ snprintf(err_msg, err_msg_length, "BMP has negative width");
+ return -EINVAL;
+ }
+ if (info->bmp.biHeight == -2147483648) { // 1 << 31
+ snprintf(err_msg, err_msg_length, "BMP height overflow");
+ return -EINVAL;
+ }
+ info->width = info->bmp.biWidth;
+ // biHeight might be negative (positive indicates vertically mirrored
+ // lines)
+ info->height = abs(info->bmp.biHeight);
+ return 0;
+}
+
+static int pdf_add_bmp_data(struct pdf_doc *pdf, struct pdf_object *page,
+ float x, float y, float display_width,
+ float display_height,
+ const struct pdf_img_info *info,
+ const uint8_t *data, const size_t len)
+{
+ const struct bmp_header *header = &info->bmp;
+ uint8_t *bmp_data = NULL;
+ uint8_t row_padding;
+ uint32_t bpp;
+ size_t data_len;
+ int retval;
+ const uint32_t width = info->width;
+ const uint32_t height = info->height;
+
+ if (header->bfSize != len)
+ return pdf_set_err(pdf, -EINVAL,
+ "BMP file seems to have wrong length");
+ if (header->biSize != 40)
+ return pdf_set_err(pdf, -EINVAL, "Wrong BMP header: biSize");
+ if (header->biCompression != 0)
+ return pdf_set_err(pdf, -EINVAL, "Wrong BMP compression value: %d",
+ header->biCompression);
+ if (header->biWidth > MAX_IMAGE_WIDTH || header->biWidth <= 0 ||
+ width > MAX_IMAGE_WIDTH || width == 0)
+ return pdf_set_err(pdf, -EINVAL, "BMP has invalid width: %d",
+ header->biWidth);
+ if (header->biHeight > MAX_IMAGE_HEIGHT ||
+ header->biHeight < -MAX_IMAGE_HEIGHT || header->biHeight == 0 ||
+ height > MAX_IMAGE_HEIGHT || height == 0)
+ return pdf_set_err(pdf, -EINVAL, "BMP has invalid height: %d",
+ header->biHeight);
+ if (header->biBitCount != 24 && header->biBitCount != 32)
+ return pdf_set_err(pdf, -EINVAL, "Unsupported BMP bitdepth: %d",
+ header->biBitCount);
+ bpp = header->biBitCount / 8;
+ /* BMP rows are 4-bytes padded! */
+ row_padding = (width * bpp) & 3;
+ data_len = (size_t)width * (size_t)height * 3;
+
+ if (header->bfOffBits >= len)
+ return pdf_set_err(pdf, -EINVAL, "Invalid BMP image offset");
+
+ if (len - header->bfOffBits <
+ (size_t)height * (width + row_padding) * bpp)
+ return pdf_set_err(pdf, -EINVAL, "Wrong BMP image size");
+
+ if (bpp == 3) {
+ /* 24 bits: change R and B colors */
+ bmp_data = (uint8_t *)malloc(data_len);
+ if (!bmp_data)
+ return pdf_set_err(pdf, -ENOMEM,
+ "Insufficient memory for bitmap");
+ for (uint32_t pos = 0; pos < width * height; pos++) {
+ uint32_t src_pos =
+ header->bfOffBits + 3 * (pos + (pos / width) * row_padding);
+
+ bmp_data[pos * 3] = data[src_pos + 2];
+ bmp_data[pos * 3 + 1] = data[src_pos + 1];
+ bmp_data[pos * 3 + 2] = data[src_pos];
+ }
+ } else if (bpp == 4) {
+ /* 32 bits: change R and B colors, remove key color */
+ int offs = 0;
+ bmp_data = (uint8_t *)malloc(data_len);
+ if (!bmp_data)
+ return pdf_set_err(pdf, -ENOMEM,
+ "Insufficient memory for bitmap");
+
+ for (uint32_t pos = 0; pos < width * height * 4; pos += 4) {
+ bmp_data[offs] = data[header->bfOffBits + pos + 2];
+ bmp_data[offs + 1] = data[header->bfOffBits + pos + 1];
+ bmp_data[offs + 2] = data[header->bfOffBits + pos];
+ offs += 3;
+ }
+ } else {
+ return pdf_set_err(pdf, -EINVAL, "Unsupported BMP bitdepth: %d",
+ header->biBitCount);
+ }
+ if (header->biHeight >= 0) {
+ // BMP has vertically mirrored representation of lines, so swap them
+ uint8_t *line = (uint8_t *)malloc(width * 3);
+ if (!line) {
+ free(bmp_data);
+ return pdf_set_err(pdf, -ENOMEM,
+ "Unable to allocate memory for bitmap mirror");
+ }
+ for (uint32_t pos = 0; pos < (height / 2); pos++) {
+ memcpy(line, &bmp_data[pos * width * 3], width * 3);
+ memcpy(&bmp_data[pos * width * 3],
+ &bmp_data[(height - pos - 1) * width * 3], width * 3);
+ memcpy(&bmp_data[(height - pos - 1) * width * 3], line,
+ width * 3);
+ }
+ free(line);
+ }
+
+ retval = pdf_add_rgb24(pdf, page, x, y, display_width, display_height,
+ bmp_data, width, height);
+ free(bmp_data);
+
+ return retval;
+}
+
+static int determine_image_format(const uint8_t *data, size_t length)
+{
+ if (length >= sizeof(png_signature) &&
+ memcmp(data, png_signature, sizeof(png_signature)) == 0)
+ return IMAGE_PNG;
+ if (length >= sizeof(bmp_signature) &&
+ memcmp(data, bmp_signature, sizeof(bmp_signature)) == 0)
+ return IMAGE_BMP;
+ if (length >= sizeof(jpeg_signature) &&
+ memcmp(data, jpeg_signature, sizeof(jpeg_signature)) == 0)
+ return IMAGE_JPG;
+ if (length >= sizeof(ppm_signature) &&
+ memcmp(data, ppm_signature, sizeof(ppm_signature)) == 0)
+ return IMAGE_PPM;
+ if (length >= sizeof(pgm_signature) &&
+ memcmp(data, pgm_signature, sizeof(pgm_signature)) == 0)
+ return IMAGE_PPM;
+
+ return IMAGE_UNKNOWN;
+}
+
+int pdf_parse_image_header(struct pdf_img_info *info, const uint8_t *data,
+ size_t length, char *err_msg,
+ size_t err_msg_length)
+
+{
+ const int image_format = determine_image_format(data, length);
+ info->image_format = image_format;
+ switch (image_format) {
+ case IMAGE_PNG:
+ return parse_png_header(info, data, length, err_msg, err_msg_length);
+ case IMAGE_BMP:
+ return parse_bmp_header(info, data, length, err_msg, err_msg_length);
+ case IMAGE_JPG:
+ return parse_jpeg_header(info, data, length, err_msg, err_msg_length);
+ case IMAGE_PPM:
+ return parse_ppm_header(info, data, length, err_msg, err_msg_length);
+
+ case IMAGE_UNKNOWN:
+ default:
+ snprintf(err_msg, err_msg_length, "Unknown file format");
+ return -EINVAL;
+ }
+}
+
+int pdf_add_image_data(struct pdf_doc *pdf, struct pdf_object *page, float x,
+ float y, float display_width, float display_height,
+ const uint8_t *data, size_t len)
+{
+ struct pdf_img_info info = {
+ .image_format = IMAGE_UNKNOWN,
+ .width = 0,
+ .height = 0,
+ .jpeg = {0},
+ };
+
+ int ret = pdf_parse_image_header(&info, data, len, pdf->errstr,
+ sizeof(pdf->errstr));
+ if (ret)
+ return ret;
+
+ // Try and determine which image format it is based on the content
+ switch (info.image_format) {
+ case IMAGE_PNG:
+ return pdf_add_png_data(pdf, page, x, y, display_width,
+ display_height, &info, data, len);
+ case IMAGE_BMP:
+ return pdf_add_bmp_data(pdf, page, x, y, display_width,
+ display_height, &info, data, len);
+ case IMAGE_JPG:
+ return pdf_add_jpeg_data(pdf, page, x, y, display_width,
+ display_height, &info, data, len);
+ case IMAGE_PPM:
+ return pdf_add_ppm_data(pdf, page, x, y, display_width,
+ display_height, &info, data, len);
+
+ // This case should be caught in parse_image_header, but is checked
+ // here again for safety
+ case IMAGE_UNKNOWN:
+ default:
+ return pdf_set_err(pdf, -EINVAL, "Unable to determine image format");
+ }
+}
+
+int pdf_add_image_file(struct pdf_doc *pdf, struct pdf_object *page, float x,
+ float y, float display_width, float display_height,
+ const char *image_filename)
+{
+ size_t len;
+ uint8_t *data;
+ int ret = 0;
+
+ data = get_file(pdf, image_filename, &len);
+ if (data == NULL)
+ return pdf_get_errval(pdf);
+
+ ret = pdf_add_image_data(pdf, page, x, y, display_width, display_height,
+ data, len);
+ free(data);
+ return ret;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 13:28:55 +0000